Dehydration can cause a blockage because the stomach-content needs to be moist to be able to move through. That said, dehydration is not the only reason for a bunny to get a blockage. Sometimes a blockage is a symptom of something entirely different. It is very serious though and generally oral fluids are of little help, the rabbit should be given IV-fluids to help soften things up.
New x-rays can be needed to get a better view, sometimes x-rays are difficult to assess.
You should ask your vet if it’s ok for you to take her home, since you are off work and can take care of her around the clock. If they think she needs intensive care that only they can provide, they will say that. A pet may often do better at home in her well-known environment. The problem is you don’t know if this is “just” a slowdown of the GI-tract or if there is a blockage, the care you give is not the same for those two conditions. With a slow-down you can syringe food like Critical Care and do tummy- massages and keep the bunny warm and comfy in your lap with a blankie on her, with a blockage, that needs to be dissolved before you can massage or put more food into the bunny.
We don’t tend to judge people here. We are all about helping bunnies and bunny-owners in need, and judging is never of any help.
Many vibes, please keep us posted, ask all the questions you want.