Make sure she is able to exercise. Don't force her to exercise, but as general husbandry for the next round of eggs after this one, it helps if females are able to fly and are physically fit. For now, I'd keep her quiet so their isn't any risk of breaking an egg inside her if she isn't used to flying around and can't control her flight. For the future, out of cage time several times a week or a very large cage that allows at least some fluttering flight. Other issues would be to make sure she has enough calcium and vitamin D. If she's on a mostly seed diet, now might be a good time to add a moderate amount of a vitamin supplement with D and a cuddle bone in her cage free choice.
Over time the biggest problem seems to be chronic egg laying in combination with small cage and/or poor diet. The first clutch might be fine, but if the environment isn't modified to discourage egg laying, then continuous laying can drain the resources of any bird. Especially one on an already poor diet. Maybe some budgie people can chime in about what they do long term to keep the bird from laying clutch after clutch. For myself, I don't have budgies but with other species, I add a nest box during the nesting season, then take it away during the off season. Just adding and subtracting a nest box tends to give them a signal that its time to start and stop laying, so they don't get into a cycle of constantly laying on the cage floor. I also keep my breeders in a room with mostly natural light. So when it starts getting dark earlier outside, that in conjunction with removal of the nest box, tends to shut down mating. I also do a complete cage cleaning about that time too and re-arrange all their perches. Just laying a clutch of eggs by itself should not be a problem for most hens. Laying multiple clutches close together or poor diet overall can lead to big problems.
Sometimes the birds need several environmental signals to stop mating. For example, I have a pair of parrotlets on eggs right now and just hatched a baby even though its late fall. The problem is that I never removed the nest box. Had I removed the nest, and changed their photoperiod and moved their cage furnishings around, that probably would have shut them down.