Hey my little one always hated the bath and shower until last few months. What worked for us was I had a shower or bath with her and played with her with the water. Also I let her I.e hold the shower head ect so she had a bit more control and independence. I also use to sing songs when putto on body wash and shampoo so they not completely focused on what they maybe scared of. Toys are always good too ☺️
Going through the same thing here with my daughter-she used to love it and never had this issue with my son x
Try a bubble bath with wind up toys and bath crayons, they have made a difference in my daughter bath time. I sometimes sit on the floor whilst she’s in the bath and sing nursery rhymes etc