Unfortunately gliders can get themselves in some pretty tight spaces including under doors to go into other rooms.
Be sure to check inside dresser drawers and inside cabinets. If there are any openings under cabinets or if the back of a dresser is open the glider may climb inside out of sight.
Check under furniture - turn it over if you have to - to look for any holes that would let your glider hide inside.
Check under all appliances including the washer, dryer, stove etc.
When I was a kid my hamster babies got out and the last one was in the storage drawer under the refrigerator we had at the time. A glider might get in to the drawer found under most stoves.
Don't give up hope but if she has not eaten in 5 days she may not be in the house - or may have gotten into a hole in the wall or under a sink around the plumbing and be stuck somewhere that she cannot get out.