Worst case, if she doesn't feed them after being in a nice quite space for a while, is you will have to have to force her to feed the babies.
You will need to get her on top of the babies, and get her to stay there for 5 minutes for the babies to feed.
If she will not let you place on the babies, you can try holding her and putting the babies to her nipples one by one. You will need someone to help you. One person hold the mom with her tummy exposed, normally on her back (tranced if possible), and one person to put the babies on her nipples. This method is more dangerous, because if mom struggles or kicks, the baby could go flying and it could get hurt or killed.
You mentioned that her teats are filling with milk, so she will want to empty them soon. I bet she will feed them on her own to releive the pressure in her teats.
Chances are that mom will start feeding the babies soon. You just probably won't see it happen.
Clean up any blood or placenta pieces. Other than that, I would leave her be until she starts feeding. As long as the babies are clean, and mom hasn't peed on them or anything. You should also make sure there are no dead babies or pieces of placenta in with the live babies. But if you've already made a clean nest, then the babies should be nice and clean already.
--Dawn