I agree with Milehigh. She is terrified that you will reject her and that's why she's acting disinterested and rude.
I adopted a 13 year old from Russia in 2004. The best thing I ever did - and I so wish I had done it sooner - was get us both to an attachment therapist. Our therapist has a lot of experience with adopted kids from Russia, and has been able to really facilitate healing. My daughter was never a "bad" kid, but never felt like she could trust me, or that I was on her side. Now she understands that and our relationship has improved 100%. She's still a typical teenager, but much happier, as am I.
See
Attachment Disorder | Nancy Thomas Parenting | Attachment.org | Reactive Attachment Disorder for a list of attachment therapists in your area.
Dee