sorry I dont have must to offer.
did you go thru the whole scent introduction process?
maybe you should try scent training again.
some introductions can fail. we went from 7 to 10 gliders, and one of the new females in the group of three was NOT accepted. she was chased into the upper corners of the cage at night, she would sleep with them fine, but at night several gliders would chase her away, so after a week we had to remove her from the colony.