You can clean her up with unscented baby wipes or a damp towel, then dry her and give her a dust bath. Keep an eye on it too make sure it's just pee and not fluid discharge which can indicated an infection. Also did she pee on a shelf? or are you using tile or fleece for the flooring? If using fleece you do need to make sure you wick the fleece before using it, so it's absorbent, and don't use any fabric softener or detergent with fabric softener when washing it. If using tile though, since she isn't litter trained you will need to wipe up the pee as quickly as possible throughout the day.
Also not all chins will pee in a litter box, it really is more a situation of you put the pan of shavings where they already have chosen to pee. If they don't already have a spot they prefer to pee then it can be hard or even impossible to get her to pee in one spot. They aren't like cats that want to pee in the litter to bury their waste, it's more they pee in the pan because it just happened to be where they want to pee. You can try to encourage her to pee in the pan though, basically every time she pees outside the pan soak some if it up with some shavings and put it in the pan, then clean up the rest. Most chins will eventually catch on, and pee in the pan at least most of the time, but it can take weeks or even months to "train" them, and they can decide one day they don't feel like peeing in a pan anymore for no reason. You can also put a smooth rock in the pan, big enough for the chin to sit on, for some reason a lot of chins like to sit on rocks to pee.