2 litter trays are good

As long as the door is open to her food area at all times, one food/water area should be enough. But generally, you should provide a litter tray for every room where she spends a lot of time – if she starts doing her business in one particular corner, just move the litter tray there.

How is her litter-training? Having access to multiple rooms too soon is not a good idea. Can you have her cage in the space where her main play area will be (like maybe the sitting room)?

I would take free roaming very, very slowly. Build up to it gradually over the next couple months, especially if she is still young and has not been spayed yet. Young rabbits are very good for awhile, but once puberty comes on, it’s impossible to know when/if they are going to “take a turn for the worse”, so-to-speak. I would hate for you to wake up one morning and find that furniture, baseboards, drywall, carpeting, drapes, etc… have all been chewed.

I built-up to free (daytime) roam over the course of several months. It started out by allowing her access to the space in my presence, then I could leave the room, then I could take a shower, then I could go up to the corner store, then I could be gone a couple hours, etc. My pair does not have free roam overnight and they never will. I like them being confined at night for their safety, the safety of our stuff, and in case of a late-night emergency (fire, tornado, etc.) where we may have to round them up quickly. My buns have a large, penned-in space (4×8 feet). If the housing is adequate (an xpen for one bunny would be very good-sized space), free roam at night is not absolutely necessary.

This is why the xpens are so great. They can have an extended space without being fully free roaming. I can almost guarantee that she is very happy. It is obvious how much you love and care for her. You are doing a great job!