Daughters Hair

Okay so my daughter is 16 months has always had a full head of hair. she came out with some curly locks. not sure her hair type i’m guessing 3a-c i have straight/wavyish hair a lot different from my daughters. i used to do plastic rubber bands on her hair but i switched to the non plastic when she was like 10 months anyways it’s been a while since i used plastic hair ties and she was never “balding” but i switched anyways because i kept seeing it would pull out the hair so fast forward to now and she is now loosing hair and i don’t know why ? i do her hair a lot maybe that’s why ? or maybe the elastic is to tight ? i’m just so sad and think maybe i should rock her fro for a while. you can’t see the balding spots when she has her fro unless you lift her hair up. any tips on how to help it grow back ? any good serums that i can use ? i currently been using the mane choice growth oil for almost a month and i feel like it’s not working at all.