No.
Breeding traps (Assuming you're talking about the little plastic traps or the nets, are very stressful) that's probably why she hasn't given birth, she's to stressed out. She may have aborted the other fry already and that's why she hasn't dropped.
If anything, take her out of the net and let her swim freely in the tank and when/if she does give birth net the babies and put them in the trap, the fry will be fine in a trap for a few days/weeks but the mother platy is totally stressed out, the area she's in just isn't big enough for her.