I don't think you would find anyone on this sight that would say you "have to" let her in to "bathe and eat". That is her demand and not her right by any means. After a bath and a meal then she will need a loan?
you can calmly explain to her that you looked up the definition of bitch and tell her it is "an estranged daughter who, while out on bail (paid for by mom), pawns moms jewelry for drugs." You are not a bitch for not wanting her in your home...you are exhibiting signs of SANITY!
she is not.
as you said she is not remorseful. she has her own plan. she knows what is best for her.
she has friends. she pawned your jewelry and shot up drugs. she is in the deep throes of addiction and I am sure that all of us will pray for her. as we will pray for you.
be good to yourself and your dear 16 year old...absolutely do not place the responsibility on her...protect her! protect yourself...ironically it is most likely the best way to make steps in protecting the addict...by protecting the ones around them! then they will have one less amend/guilt/shame item to deal with!