There are a lot of things that come into play regarding reproduction.
This is the way it should go normally (without controlling her diet strictly... and explained to the best of my ability and likely over-simplified)...
the female should grow up at a steady rate without being constantly overfed or underfed, with appropriate supplements, temperatures, lighting, well-fed/gutloaded insects. When she reaches sexual maturity she would start cycling and produce a clutch of infertile eggs (if not mated, of course) which would not normally be a problem as long as she has a suitable pace to lay them and does not see anyone watching her when she is digging. She would fill in the hole and return to the branches and continue on with life. If things were continued this way she would likely lay another clutch 4 or so months down the road.
If she things do not go "normally" (and this can include a variety of things such and improper supplementation, overfeeding constantly, reproductive system issues, etc.) and especially if she does not have a place to dig in her cage, then she could miss the egglaying time/due date holding the eggs in...or she might pass it simply by not have enough of her husbandry needs met sufficiently that she could go through the normal course of events. If she passes the "due date" then she might return to eating and seem like there is nothing wrong with her for a while....few days or so...but then suddenly go down hill to eggbinding.
There are several problems with her going past the "due date"....we don't know exactly when the hormones, etc. shift and she can't lay the eggs most of the time so its hard to know when she has reached the point where the oxytocin will work and when its too late for it. Once its too late for it there is only one option....surgery to remove the eggs/spaying her....but then at what point do you do this since you might not know when it needs to be done until she shows signs of going downhill...at which point her odds of survival start to rapidly decrease.
This is over-simplified and doesn't cover all the reasons or possibilities....but there is little to no way of knowing when the female actually begins being in trouble...we can only take our best guess from the experience we have had and from what we are told has led up to this point.
Hope this helps you see the dilemma?