@Carl6254 If you've witnessed what one might characterize as child abuse, your first port of call should be the local authorities that deal with that. Here is the first resource I can find for Idaho; they might be able to make a child-welfare check while protecting your anonymity: https://healthandwelfare.idaho.gov/services-programs/children-families/child-protection-and-foster-c...
As far as Airbnb is concerned, there's no specific formal protocol for this situation. If you were able to get through to Airbnb reporting a problem with your guest, the one thing customer support would be able to do is terminate the booking and refund the guest for the unused portion of the stay. Their operators are not trained specialists with any capacity to calmly analyze the situation and mediate on your behalf - that's not a service Airbnb does these days. This would leave you with the task of throwing your guests into the street, as it would no longer have any protections against damage etc. This is undoubtedly the worst outcome from a child-welfare perspective, as it only increases the stress and destabilization they're already experiencing.
If for any reason you feel the stay is not working out and you'd like to end it early, this is something you can try to work out one-on-one with the guest - generally you'd want to offer a fair notice period and refund at least the unused portion of the stay. If you reach an agreement, you can formalize it by sending the guest a booking alteration request with the new checkout date and price, which becomes final if and when the guest accepts it. This step allows you to bypass the byzantine customer service process altogether. But knowing that your guest might have anger-management issues, you'd have to approach it very delicately without expressing any opinions on her parenting techniques in order to get a peaceful resolution. While there may be child abuse going on here, you don't know the whole background of what happened in her life and why she's resorted to temporary housing - maybe she's just going through a really hard time in life and needs someone to talk to that's not a child.