First of all..... hiiiii! welcome to pc!

your friend is totally out of order, but it sounds like she has an addiction (I know you shouldn't think, oh it's an addiction so I'll cut her some slack), you have to be tough, she needs some help. But, it's not down to you! I think you were put in a very difficult situation, but I do think you did right by telling her she had to leave. But, does she know why... did you tell her she can't take your money and possessions to fuel her addiction 'just because' she's a friend.
This is a tough one, does SHE believe she has a problem? Maybe you can post this again in the Substance and Alcohol Abuse forum? I'm sure there'll be a lot of people who can give you better advice.
But here's some hugs to get you through
((((EozzoE))))
Take care,
Molly