hi
your pics are a little blurry & hard to see but she certainly looks quite fat, i find that our mollies get a sort of boxy shape when they are about to drop, esp when you see them from the back. the male is just doing what male mollies always do when theres a female around - continually trying to mate with her even if shes already pregnant.
is the female in a breeding box?? leaving a pregnant mollie in one of those for too long will just stress her out & she may abort the babies or hold onto them for a lot longer, she also may eat her own babies if you leave her in the little breeding box with them . what other fish are in the tank with your mollies???
it might be better & less stressfull for the female if you leave her in the main tank until she has had the babies, then catch the babies and put them in the breeding box to be safe until they are bigger.( i use a little plastic cup as netting can harm them & its best not to take fry out of water if you can help it) to ensure the fry have a good chance can you put in some floating plants in your main tank? or just float some normal plants, gives the fry much needed cover & hiding places. if you do get fry & then move them to the breeding box its a good idea again to float some plants at the top of the box as it gives them shade from strong lighting. it can be a little tricky to catch the babies but just takes a little patience & you'll find quite a lot will survive in the main tank until you can get them. we have 3 newborn black mollies at the moment in our fry tank, they all survived 2 nights in with our greedy tetras & tiger barbs before i got them.theyre in there with 3 other baby black mollies that were born about a month ago - they also survived in the main tank for a couple of hours till i found them. you also dont want to be overrun with babies so letting mum give birth in the main tank allows nature to take its course so to say but you can still have the fun of raising a few babies - much easier to rehome than 50 ( we ended up with 50 swordie babies last year, very luckily we found a lfs who agreed to take them all in exchange for some plants)
any chance of a couple more piccies??? might help me try & see how pregnant your mollie is.
hope this helps a little