15yr old wants to to side hustle need help with a wavier

[Matthew Dodrill]

Hello BP family.  I have a 15yr that wants to start saving money and realizes she has some skills but still wants to be a kid for a little while longer.  I have taken her around with me working on a few different projects and she picked up that snaking sewers is fairly easy.   The question is or more rather we are looking for a waver / release form that she could present to clients expressing she can't be held liable for say a collapsed sewer line...  Example "hey my sewer is stopped up, will you snake it for $150",  she agrees only to find out that a tree root has got it and broke apart the sewer line.  She is afraid she will be sued and have to dig / replace a sewer line.  Have you come across a form of a handyman that they are not reasonable for damages discovered to be pre-existing?