I think I have a different perspective… my bunnies started out in a quiet room to themselves, but were VERY happy to be moved to the living area, where there were people and things to see. Especially for an only bunny, there is a social aspect to consider. How does she seem? Skittish, or curious? If Flower seems interested, and isn’t hiding or thumping or charging the cage, she is probably safe to hang out with in a controlled setting. As a former four year old bunny owner who cringes at the things I used to do, please make sure your daughter understands how to nicely visit the bunny…namely, no grabbing, squeezing, screaming, poking….yanno, four year old things.
If you check out the Habitat page, you’ll see lots of people (including me!) who have x pens as the full time habitat. Her day to day space should be around 8 square feet, so a cage alone can be too small. That has the added advantage of being big enough for a vacuum, or for a person to sit in with her, even with a litterbox and a place for bunny to hide.