I'm sorry, but this sort of situation is extremely neglectful and to be perfectly honest, plain uncaring about the rabbit's wellfare. This is just waiting for something to kill this rabbit. Predators, cars, teenagers (Don't think it can't happen, I know there are plenty of teenage boys that would do some nasty things to an unsuspecting bunny), disease, parasites, heat, cold, lack of food (What if one day, she doesn't come back?), poisonous plants... The list goes on and on.
I feel very strongly about this since my young girl, Buttercup, was also a rabbit in a similar situation along with her two companions, Skittles and Thumper (RIP). Buttercup was not in great condition and Thumper was even worse.
Thumper had been very fast and agile too until she was wandering outside the yard, was attacked by something and came back with permanent damage to her rear end, causing her to have an odd, limping hop for the rest of her life. She died far earlier then she should have because of the harsh life of living outdoors. I just hope that we got Buttercup out of there fast enough to prevent her such misfortune.
Too many people claim there bunny is "happier" but what evidence is there? Are you a pro at reading bunny body language when you admit that you don't really know much about rabbits? Do you think your rabbit is happy living in constant fear? Do you think she'll be happy when one day you go outside and find nothing more then some shreds of fur because something got to her first? It's graphic and tragic, but it's the reality. If you do not keep her safe, at some point, she will die far too young. She's a rabbit, and pretty much everything eats rabbits.
There's nothing wrong with keeping a rabbit outside if it is done responsibly in a secure, well kept hutch, and being brought in during harsh weather.
I don't mean to be rude, but I really only look out for the rabbit's well-being.