Your D should discuss the timeline with career services at her college. Some schools do not allow these “staggered” (aka exploding) offers, and those that do, generally have guidelines as to how to manage them.
Continuing to interview once you have accepted a job is typically frowned upon (it hurts your fellow students by taking up a slot), and reneging on an offer isn’t very honorable. It happens-- much more now than 10 years ago- but it’s not a good practice. I’ve had students tell me “XYZ company won’t remember me in five years if I decide I want to work here then” when they renege on an offer. True. We have a global database, but reneging on an offer many years ago isn’t likely to come back to you.
But recruiters change jobs- and we NEVER forget the names of kids who have reneged!