No, don't move the mother AT ALL not worth losing her for some fry if you get any IMOE and yes a female can abort her eggs and reinpregnate with another male but can only be fertilized by one males sperm at a time ... Even if you moved her a week or two before it would stress her ALOT and could lead to less healthy fry and then after she gives birth you would need to leave her in there for about another week to get over the stress and once ou move her back she will be stressed once again ..... IMOE rocks,decore,large gravel are best for fry survival ....
EX. my fry like to get into a plastic shoe in their tank,in the larger holes in the gravel,in the bottom plants,or inbetween a piece of slate leaning on a larger rock .... if they have floating plants they will surely be chased IMOE plants on the bottom/nottom hiding is the best for fry #'s