Yes. Good luck with them...
Can be very hard to tell with mollies, especially when young.. sometimes milloies can suprise you and dont get very big..
If i was to estimate this one though id say 7-14 days.
If you have her in a birthing tank where there are no other fish, I would leave her there. There is no point in giving her more stress by moving her back and forth between tanks. If you are talking about a trap and not a tank then get her out of it until she is very close.
My mistake, from the pics she looked like she was in a trap.