Same here. When I first met Amata I thought that she will be one of the major characters in game. Perhaps even a source of getting your hands on vault equipment. But I was disappointed that she did so little at the end. I wanted more storyline or side quest (perhaps even main quest) about her.
Then again, although Fallout 3 was a fun game to play at first, it needs a lot more storyline to make it really worthy of the Fallout title.