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Why not just leave her loose? She may eat fry in the trap if they can't hide also..
A screen type breathing trap a fish could live in...A plastic floating bin with slots eh not so long? epsecially if not cleaned and still fed...
Lots of plants [fake or real] in either place is best...I let livebearers give birth in tank and then pull the fry.It is just easier...They add up eventually.