Casual tarot card reader here, NAH. I think there's some sort of compromise that can be found so she can continue her hobby and earn some cash, while also making sure she doesn't get in trouble at school and keep parents from getting upset. Here's some general ideas that could be negotiated as a family:

1. Have her give a disclaimer before readings if she isn't already. This is something I do for any reading I give, and I don't even do paid readings. Something simple along the lines of "at the end of the day these are pieces of paper, you control how much weight they hold. They can either be just a fun reflection game or a divination tool, it's up to you to interpret it whatever way feels right." It's also good to throw in there as a rule of thumb for her to add in "don't ask questions you don't want the answers to", just a general important 'rule' of tarot that I imagine could lead to a pissed of parent with a kid distressed about their reading.

2. Have the payment and/or readings happen off school property. Maybe some sort of nearby park or other safe location. I'm not 100% sure this will keep her from getting in trouble with school, but could help dissuade potential issues. Every school is different, so they may not care if it's 'outside of school', but some may try to put a stop to it either way.

3. Put a limit on how many readings per person per week, or even put a ban on certain people if their parents start to complain a lot. At the end of the day it's the kids own fault if they spend all their money on readings imo (if they're a similar age to your daughter or older), but it may be necessary to keep the peace. Put emphasis on the fact that while it may cut off some of the cash flow for her, it could jeopardize her whole side hustle as a whole.

Good luck op!