The dead fry and eggs is not a good sign, it could mean that she dilvered too early or was generally too stressed at various points in her pregnancy. How many gallons is the tank and what is its stocking (numbers, types and sizes of fish etc)? Did you put her in a breeding net or anything while she was pregnant etc?
i have a 42 gallon tank with 6 guppies, 2 mollies, 6 platies, 5 neons and 2 plecos (6ins)
i put her in a breeding net for the last couple of days as the other molly wouldnt leave her alone