You are not required to have 0 children to have your MMJ card in any of the states that allow you to grow MMJ. I have children in my house and it is legal. You only need to be concerned with the adult girl telling the wrong people (thieves- not cops) that you are growing. Some may try to steal your plants, bud, and or equiptment. I'd be concerned if you aren't very close to her. As for the child being in a legal grow house, no worries. My Granddaughter just turned 5. She loves sitting with me while I care for and check my plants. She wants to help, but she's not allowed to touch so I find ways she can help. I let her tell me her opinion on the color when I'm checking PH, etc... Some people might think it's wrong, but it is in my house, and so is she. I feel it is better to make sure she knows what is ok and what is not. Sorry, I'm getting off the subject of your question. In my opinion you have no concerns about the child, just the mom. I agree about insisting on her staying elsewhere, unless there is no doubt about trusting her.