I tried to phone some vets who know about reptiles but couldn't get them on the phone. She seems to have troubles breathing: she opens her mouth wide, the breathing's slow. Could it be that her lung is compressed by the unborn babies?
Furthermore, the belly is really soft, a bit like a sponge, to the touch and I can feel some "lumps" underneath. The cloaca is really visible, and you can see the hole if you pick up the tail a bit.