8 year old step daughter wetting seff never use to?

You wont be able to help her yourself if it is a medical condition and if she doesn't even realize she is doing it its probably a medical condition. The only other option is to get her to go to the bathroom every so many hours, stop drinking after a certain time at night, see her fidgeting or something send her to the bathroom. It could also be because of some form of abuse or major stress get rid of that and it could stop.