This won't be a popular view on this board, but I agree with Vopel. Once Drummer was up, I think she was worried that if she didn't brace herself on the way down her whole weight would come down on Lou's head, which it would have. To me, it did not look like she was trying to make "excessive" contact - she was just trying to minimize impact on the way down, and the best she could manage was to try to get her hands on Lou's shoulders to brace the fall. As she went down, her hand slipped off and her arm went around Lou's neck, which was definitely non-ideal. But seriously, ask yourselves what you would do different/better if you're Drummer and go up and then Lou pump fakes and you're suddenly literally falling on top of her.
I agree UCLA was very physical all game, and sometimes pushed the boundaries, but I really don't see what Drummer should have done differently once she was up in the air right over Lou.
To me, the correct call was a shooting foul but not a flagrant or unsportsmanlike.