I want to say something like... "the girl shook her hands through the kids hair as a gesture since he was really sweet to her".
We don't say shook her hands through the kid's hair. com/image-photo/****-young-caucasian-girl-seen-behind-1448379029 Clive
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We don't say shook her hands through the kid's hair.
We often say eg stroked the kid's hair
or eg ran her fingers through the kid's hair
stroke - Here is a photo
If you mean she playfully mussed his hair, she ruffled his hair.
Onelook.com has a reverse dictionary that often helps when you need such a word. I went there (not that I needed to) and entered "hair fingers", and "ruffle" was the fifth on the list under "verbs".