Hmmmm... have you tried bubbles, some new 6m old bath toys, getting in with her, if she is able to sit upright perhaps do her bath in the kitchen sink (I advise doing this with a bath ring as they are SO slippery).
Owen went through a period where he hated the bath too, I think around the same age. I switch to giving him a bath in the tub with him in a bath ring, and also me in the tub too and that seemed to help.
HTH, good luck! Remember, this too shall pass