a friend used me for my heels... (i just want to talk it off)

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So, a friend of mine has changed a lot lately. She picked up new habit where she will refuse to eat and focusing on getting high, smoking and drinking. Usually she will hang out with my best friend's housemate. However, she will ignored us because we don't smoke and all. She changed a lot and for a person who was depressed because her last semester performance was down the drain she did not do anything significant to pull it up. She asked me once whether I like her changes or not and I told her I don't like it. She ignored me and left the room and refuse to talk ever since. She told my other friend that she think I am angry at her and she don't like the way I yell at her and my friend's housemate for banging on the door the other day. I was having my emotional cycle when the housemates and their friends taking turn banging the door because they refuse to bring their own key. Few days ago suddenly she said hi to me through chat box. she said how she miss me and all. She asked me to go out clubbing with them and her new girlfriends. The problem is this, the girls that she hangs out with now go wild when they drunk and they can't take care of themselves. Knowing that I won't get drunk, I don't want to be the babysitter for them. The next day she keeps on calling me because she want to borrow my killer heels. Last years, she took 2 of my wedges with her and use it. She returned it once she can't use it, which is basically means its broken. She is currently having my other heels. So I said no, she can't take my heels and my housemates are not home so no way she can get into my unit. Today I was not feeling well and apparently she is going out for clubbing again. Only the day before she said she's not feeling well and said that she's sad because her parents' house flooded and the whole house is in a mess. I did not know that she's going out because she never call me. What irritates me is the fact that she came to my unit, knock on the door and once my housemate let her in, then only she texted me that she wanna borrow my heels. She didn't know that I'm in the room and I put my phone to silent. She refuse to give up that she wants my stilleto but I know that once I give that to her, I will never get it back until it breaks. She wanted my other wedges and I asked her where's my heels that she have. She then said she's going to another girl's place to get heels. i mean, seriously, you have money to go n get booze, you got money to get some stash and get high, why can't you invest in a proper heels? I don't want to give her any of my heels anymore and I don't think it's appropriate for her to just come into my unit and get my shoes without my consent. I've put my heels inside my room to avoid this happen the next time. But it will be soon til she sms or call me again to borrow them. As long as she don't need it or my help for her assignment, I will be this insignificant acquaintance of her. I don't know how to react except for ignoring her. Telling her nicely will make me look like a villain. Even her own parents can't scold her. Help!