Haha...she looks like she's at full term by now and should go any day now.
However, keep in mind that livebearers can hold. She will do so if stressed(like say you put her in a breeder or an uncycled or over-crowded tank...) and if stressed may abort or reabsorb and not give birth.
Livebearers can pause pregnancy for weeks to months if they so desire, they can also grow multiple broods at once and instead of giving birth every 28-32 days can do so twice in that time period(in very rare occasions they can have even more births in a months since they can have multiple broods growing). They can also mate ONCE and hold sperm for up to a year without having babies, or they can use that stored sperm to fertilize their eggs monthly for several months if they so desire.
If you let her be and don't move her around, have her in a nice calm tank where she feels secure, and where there's enough room(mollies need 25-30 or more gallons to live properly and be happy and need to be kept in groups of no less than four, five or more is better)...she should pop soon.
She LOOKS laborey in that photo. You may notice her holding still a lot more, sometimes they even wiggle from side to side, hang out in a corner or just swim slowly around...some will actually slam themselves into things here and there...as if they itch, or have parasites when in labor(it's not too uncommon. I can't imagine all those babies popping out of their eggs and wiggling around inside you feels good)....others move around oddly, back and forth, I've seen some swim up and down in one spot for long periods....just make sure it's peaceful in there and kept quiet, she'll have her babies soon enough. =)
What a pretty little Dalmatian. =) If you get some thick stem plants, like guppy grass, java moss and the like, the babies will have an easier time hiding and surviving, but do expect many casualties if you keep them all int he same tank, no matter how dense the planting...she looks like she'll have at least 50 babies, maybe more. Depends how big the kids are, and how much of that is actually from babies and not being a well fed fish. And also if she's carrying a second or third brood along with the ones about to be let out.