Your guppy looks like she will have her fry in less than a week. Do you have a place for the fry to keep them safe other fish who will try to eat them? To help the fry survival rate give her a raft of bushy plants such as hornwort and they will hang out in it where the other fish can't get to them. The fry also eat microorganisms off of the plant so it is a food source, too!
Best of luck