Hi there,
I am a mother of three. My last child was nothing like her siblings who LOVED bath time. She, like yours from the beginning, hated bath time. She especially hated to have her face & head get wet. I found she did best if I got into the bath with her. She seemed to be comforted by my presence with her in the water. I also found see did better if the water was just barely warm.
We did this until about 2. Now she is three & is still very particular about getting her head wet. She is very independant and has to lay her head back in a shallow tub to rinse her hair (I add conditioner to her shampoo so that we only go through this process once). She still will not go down the slides at the YMCA because she doesn't want her face to get splashed.
So, this is so strange, but I have learned that all children really are different, even siblings. They are such a blessing & we need to always be changing how we parent & interact w/ each child as they have different needs.
I hope this helps,
Adienne