What is her compelling reason to stay in the US?
The length of her overstay - less than 180 days - does not result in a bar to entry. However, she must convince a VO to grant the visa. You are not required to give a recommendation; since you seem to have reservations about her conduct if she returns, do not do so. Your friends are not required to allow her to see the child unless required by the adoption. She has no relationship to the child. Your friends might want to speak with the attorney that handled the adoption if they fear unwanted contact in order to be prepared should she be able to enter the US.

