Question About Hosted Child

We recently hosted a 7 year old from Eastern Europe who seemed great on the surface (though hyper, maybe due to overstimulation). We were told before hand she had been abused, though we don't know in what fashion. She acted what seemed "appropriate", not that I really know, for about 5 days. Then, she decided she didn't like me, the mother figure. I have no idea why she changed so suddenly - nothing happened I could put my finger on. She glared at me, wouldn't let me run her bath anymore or put her to sleep. She told a translator to make sure I knew never to touch her. If I did by accident, as when handing her a toy, she would stiffen right up. When she put a ribbon in her hair and I told her she looked pretty, she pulled the ribbon right out. When she was with the family as a group, she was great and she ADORED my husband, hugged him, etc. When we were alone together, however, she made faces at me. I recently had pictures of her visit developed and I was surprised to see her making unhappy faces whenever the photo was the two of us together....and joyful in all the others. We did not adopt this girl. I was worried about the difference between her behavior to me and everyone else (she was charming to everyone else even relative strangers). Is this kind of behavior - where the child pushes away one parent - common in PI kids? Is it something I overreacted to, since she was good with us as a group? I want to learn from this experience because we would like to adopt and I know there will be issues with any child. The child, by the way, found a wonderful home.