It's going to show up in any drug test for up to a month. I don't think there's any way you could successfully press charges, all she would have to do is say you took them willingly. And then the police would know you drove with your kids in the car under the influence, which would hurt you, and, you would have hospital records showing you with drugs in your system.
I would drink lots of water, eat lots of food, get lots of rest, and chalk it up to experience.