FTM, kiddo going to pre-k

So... obviously I’m a FTM. I have really bad anxiety when it comes to my little, and she’ll be starting pre-k in September. I know I’m not going to be able to prevent all the things the other kids are going to give her (stomach virus, cold, flu) etc, but my biggest fear is lice. 😩 I have long hair and she has long hair, so getting lice would be a nightmare. I’m looking for recommendations from other mommas who have found a way to keep the lice away, I made it my entire 29 years of life without it and I feel like my luck is about to run out. I know to keep her hair up, we’ve talked about not wearing or using anything that is used on another person’s head, and I know tee tree oil can help, I’m mainly looking for a hair product I can put on after her shower and something I can put on her backpack/clothes. Help an anxious momma out! 💜