First check out my link on everything you will ned to know about when your livebearer will drop its fry, its located in this froum and is stickied.
or just
click here to go to it
Breeding traps are fine to use in my opinion ands i have been using them for well over 15 years.
if used correctly the fish will be fine, never leave a fish in a trap for more than 48 hours, always have the lights out in the tank whilst the fish is in, cover the tank if in a well lit room, feed her a little food when putting her in, and most important "dont be cheap, buy the BIGGEST breeding trap"
IMPORTANT
(
Most people catch the fish with net then put them in the trap..
its best to just use net to persuade her to move towards the trap then scoop her in with the trap (put trap underwater below her), this way no handling at all has to be done.)
if nothing after 48 hours release her, then dont try again til a few days later, if it has its fry within these few days then its unfortunate and you will have to try to find any fry that have survived and net them in the trap.
Look for signs of her ready to give birth (
all explained in the link i gave you)
Another which many people favour, is to heavily plant your tank so the fry have hiding places, this is also a good way to save fry.
can you upload some photos of your molly to here? if possible from a side view, and over head view?
Regards
Wayne