HELP!!! My neighbor is extreamly paranoid!!

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My neighbor is a nice person. She's the only neighbor I really talk to, but recently she's been stressing me and my husband out. She honestly thinks her ex-boyfriend (50 something years old) is stalking her. They broke up about a year ago and she's made several claims saying her ex... -broke into her house several times just to torment her -hacked into her computer (which he gave as a gift) -stolen her cat (proven not true, the cat was hiding) -took random papers from her apartment -changed things around in her apartment like moving things around on dresser -took clothing of hers -whipped feces on some of her toilet paper which was in the closet -broken in to feed her cat -Left a knife on her kitchen counter ...and so on. She's changed her locks 7 times. 6 of which have been without giving a key or telling management because she thinks her ex is paying off the manager and/or maintenance to obtain her key and the key to her garage since she said her ex broke in and she saw his car pull out of her parking garage (which is located directly under my apartment). She has even claimed Me and my husband hacked into her computer because she gets pop ups (she doesn't have an anti virus or firewall protection and doesn't know how to use the internet) and my husband has gone over to help her. Her family and friends don't believe her because there is no solid evidence to back up any of her claims. She puts things (tables, speakers, a cat tree) in front of her door and also has a chain lock (she's putting on another lock as well) and still claims that he gets in and then re locks her door, manages to put the chain back on and move everything back in front of her door. There is no sign of forced entry from any of her windows and pretty much I don't hear anything. My husband sleeps in the living and stays up at all hours of the night and we always can here her coming in and out of her apartment since our doors are right next to each other and we never hear anyone going down the stairs. She said her ex is old, fat, and slow and my husband would be able to hear someone rushing down. I'm here during the day and never hear anything suspicious. A little background of what she's told me about herself. She is very forgetful about where she puts things. She drinks quite a bit and is bi-polar, depressed, and paranoid (being medicated them all...at least the bi-polar ) When she stopped drinking for a week she became more aware of things she did, but when she gets stressed (which is easily) she starts drinking again or starts downing coffee which makes her more paranoid and very skidish. She's very upset because no one will believe her, and honestly its getting really hard. She calls my husbands cell at all hours of the night asking him if he's heard anything. I've been trying to be the middle ground on this, thinking of logical explanations of what she's been experiencing. She's been taking sleeping pills so she might just be dreaming of most of these things at night. They do tend to happen when she's starting to fall asleep or suddenly wakes up from sleep. I've looked up personal & home safety devices which could be affordable for her to put up in her apartment like alarm door jams or hooks and other things which will allow her and everyone else to hear if someone breaks in. My husband wants to install a security camera either near our door or in her apartment, but we can't afford to buy them (roughly around $200-$800) and neither can she. My husband gets stressed a lot because he's the one going over at night trying to calm her down saying no one is breaking into your apartment. She's tried to get a restraining order but since there is a lack of evidence its getting hard for it to stick. She hasn't had much contact with her ex. he refused to take her calls anymore because at first she accused him of a lot. (note: they met through their therapist, she's been seeing a therapist for 17 years and he said her behavior is out of the norm of what she normal is on good or bad days...at least that's what she told me) I really don't know what do to anymore. I see her scared out of her mind and I'm telling her to not be scared and its probably all in your head but I've given her options of keeping herself safe and we're keeping an eye and ear out for sounds at all hours. She knocks on my door all the time so afraid saying he's Houdini since he breaks into her apartment yet there's no sign of a break-in. She claims since he's always on the internet that he learned how to break into a bolt lock, chain lock, and barricade and leave no signs that he was ever there other then some type of sound she hears when she wakes up. Does anyone have any ideas on how I should approach the situation now? I've even considered letting my husband staying the night on her couch to prove nothing is going on. HELP!?!?! PLEASE...I don't know what to do anymore.