Even if you did not see them if you noticed the activity then most likely all the placentas have been passed. Keep your distance until she comes to you for assistance or if you notice any distress like meowing or crying painfully. You should have a litter pan in the area and figure out were you plan to move the kittens to a warmer area and which box you plan on using. After you move then close her in with the babies and food, litter box etc. If you can get everything ready and when mommy leaves for a potty run put the kittens in a box and lead the mommy into the location where you have everything setup and close her in with her babies. keep your kids and other animals away. Few people have the daddy but he needs to be kept away also.