Kevin,
My mollies do stress out a bit when I put them in the breeder trap, but will settle down within a day. You might also leave the lights off a bit more than usual while she's trapped so much closer to the light. Personally I would rather stress the mama by placing her in the trap than have her tankmates chase her all over trying to eat the fry as soon as they are born. Of course, that's just my opinion.
Congrats on the fry! Platies are tiny!