Hi there.
How lucky you are! Quail very seldom go broody and in most cases they manage to incubate eggs because the eggs are in their preferred hiding spot.
The best way forward would be to ensure that there is ample feed and water close to her nesting area, but not close enough that you'd disturb her while cleaning feeders and replacing water.
The hen will regulate herself, same as if she wasn't broody - but be sure to keep an eye on her just in case she's a rare hen that's willing to starve to incubate her eggs - being broody is basically a hormonal driven trance. If anything she should leave the nest once a day on her own for a few minutes to eat, drink and defecate.
Try not to disturb the hen unless you REALLY have to, and if so, do it at night - this will lower the chances of breaking the broody behavior and the possibility of clutch rejection.
ABOT