Edit: I looked at it a second time, watching for signs of fear. While I was wrong about the tail going the whole time, I still don't take her as an abused girl.
Definitely not abused. She wasn't cowering. Just uncomfortable.
Kind of like when a kid is happy to see an aunt, but doesn't want the big hug they know is coming.
edit: I thought of exactly what it reminds me of: It reminds me of when I come toward Petey with Nail Clippers in my hand. he is happy to see me, then when he sees the clippers, the tail lowers slowly, the squinty eyes, the pulled back moth corners, slight lowering of the head, and ears out.
When he is really, really happy the ears go straight back, not out to the sides.
She is being very submissive, and very exaggerated in showing her submissiveness. http://www.aspca.org/pet-care/kids-and-pets/caninebody_language.pdf - if you look at "Active Submission" that is her.
If it were me approaching, I would stop, because I wouldn't want her to feel like she needs to give such huge submissive displays.
I wish Barbara Handelman posted more often. Her blog is so wonderful to learn how to interpret very small motions in dogs.