Pregnant or something else?

[woodcarver]

Not having seen the mollie shot (only the dogs !!) Just going by your description , I have found this to be a condition often found in Mollies and Guppies after several broods . I think the kindest thing is to put it out of it's misery as you are most unlikely to find a cure .
McInery say's a salt water bath ( I oz sea salt to 1 gallon water ) has been known to prolong the fishes life for up to two months in the case of dropsy.
Good luck
........................Dave