I really don't think Heather (being a more senior member) would be happy about moving out of "her" room, even though she spends a lot of nights with Tommy at the DIK mansion. Quinn wouldn't like it because she would have to hide her hooker side-business from Heather, since she already knows Quinn is dealing drugs through Tommy.
The last round of recruits were not planned originally, with Lily and Ashley being ones that Sage pointed Quinn to recruit. Josy was a surprise to Sage when she showed up at movie night, so like most things Quinn didn't think her plan to expand all the way through to figuring out who would live where. I also don't think she expected Maya to make it to sisterhood based on the list of items she was given on her scavenger hunt, which were way more extreme than any of the other girls had to do. To recap, Quinn wanted Mona, Cami, Ashley and Lily, then on the spur of the moment added Josy just to spite Tommy. She didn't want Maya and may have thought one or two of the other daughters also wouldn't make it to the end.