Aggressive Behavior In 10 month puppy

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Hi everyone, thanks for reading this. I have a ten month old Yorkshire Terrier named Belina who has began acting out. I delivered this puppy and finished raising her by hand at just 3 1/2 weeks old when her mother turned on her. She has never been mistreated or hit in any manner, punishment has always consisted of scolding or a time out in her kennel. In about the last month or so I had noticed her becoming increasingly territorial around the other dogs concerning her food and toys. I worked with her and now she is fine with sharing again and has a special place the other dogs are too big to get to for the stuffed animal she just can't bring herself to share. The last three days/nights (hours are odd in this house) she has began guarding whichever member of the family is sleeping and it is quickly getting out of control. A few minutes ago she attacked me for walking into my living room where my brother fell asleep on the couch, actually attempting to bite me. Usually she just growls at you, this is the first time she has tried to bite anyone, ever. I put her in her kennel yet she continues growling at me, another behavior Belina has never exhibited as placing her in her kennel typically shames her and she sits with her head down until she is released. This dog is an extremely intelligent very hyper puppy who used to be excited whenever someone new came into the room. She is up to date on all her vaccines, sees a vet regularly and has already had her first heat. I called her vet, they referred me to a trainer I cannot currently afford. I called the breeder she came from and was told most Yorkies get this way and to "beat the hell out of her, she'll learn, mine did"... I cannot even begin to describe how angry her advice made me, and yes I have already reported the woman for animal abuse. Has anyone here had this issue before? If so, how did you correct it? I am not willing to hit or physically harm Belina in any manner, she is only a five pound dog! This issue must be resolved though, it'd be a disaster if she had done the same to my mother as her skin tears very easily.