M.C.
This is a new one on me however I would try maybe not bathing her everynight and see what happens. Since she is so little she is not crawling on the floor getting dirty nor is she running around and perspiring. Try to skip a night and see what happens. I would also try diming the lights, getting a toy that provides a light show on the celing, maybe just let her play in the water without bathing her ( you can put some baby calming bath soap in the water). My daughter who is 5 cries when her hair is washed and she has been this way since she was born. We do the best we can!