Thanks for the suggestion! In this case, I agree with 007Sean. That was how I originally did the introduction, and how I would normally do introductions with individual(s) into a larger group [rats, fish, etc]. Mix up the territory, move them at a time when they're sleeping/sedate/distracted and unbalance the social order so the newbie(s) get a foothold. In most cases it works.
I could see the 1 by 1 thing work pretty well with chickens, especially if you have 1 coop and can't mix up the territories, but I don't think it'd work out with quail due to the social structure, just from my observations. The quail remind me more of doves than chickens. They do hang together and some individuals are more dominant but I can already see them breaking apart into smaller groups during the day (loner joins the group without the bullies). They only seem to come together at night to roost and when there's food/danger LOL.
I hadn't plan on having two groups or a loner. If this doesn't work out or escalates to food/water guarding or physical violence, she'll go back in with the button quail, now that I finally finished their new and improved security on the enclosure. But I think at this point it is a matter of how bored/tired the few bullies get the longer she's in the group now that she has some buddies (and has stopped acting like an absolute raving nutcase anytime one of them looks at her). I've already seen one of the bully roosters be inconsistent about chasing, so I suspect it is growing old.