That sounds like exactly what I do with rats~ sometimes I seperate a specific female if I'm looking for something genetic from her. When I put her back, sometimes there is a scuffle, but just re-establishing dominance in the colony.
Mice on the other hand~ I've tried it~ and have dead mice to show for it. Never had it work. I've heard people say it works~ but it's never worked for me. Every time they kill her. Maybe my strains are just extra nasty? Probably more like your strain is less nasty than usual~ because I'm sure I have discussed this before and others have mentioned not being able to alter a mouse colony in anyway once it is established.
Good for you if it works