I have straighter than straight hair that loves being in a tangle. What works for me at the moment is combing while wet to detangle and a bit of argan oil after blow drying. You only need a small amount, applied from tips to mid-length and not the scalp.

For the swimming, I also highly recommend a silicone swim cap. They won’t pull at her hair like rubber ones do. She can also wet her hair before getting into the pool to minimize the amount of chlorinated water it absorbs. Or do both!

Give it the silent treatment, it’ll come around soon enough.