Hi! I have 2 nearly 6 month old rabbits. Both from the same litter. We were originally told they were both boys but ... Now a boy and a girl

they were bonded so well, grooming and laying with each other. Obviously they had to be separated around 3 months as Ralph was starting to hump Rosie. They stayed in seperate cages with a wire partition for about a month with supervised play dates!! Due to lack of space we had to move them outside in their own hutches. We still kept up with the supervised dates but Ralph would not leave her alone so we had to shorten a lot of visits.
Ralph got neutered a couple of weeks ago so I decided it would be good to start the dates again. Started in the living room, seperate areas at first then opened it up. Had some nice cabbage around so they would be distracted for awhile. However Rosie is having none of it. Everytime Ralph even attempts to go near her she runs. Ralph isn't making any attempt to hump her anymore he just wants to go say hello. Rosie did hump him (she has always been the dominate one) I let this happen.. Just moved her off slightly so Ralph didn't get fed up. I've tried this a couple of times and it seems to be the same behavior from Rosie with no real inprovement.
I'm a little bit stuck on what to do next.. Some people say to get the doe spayed ASAP. Which we do intend to we were waiting for her to be a little older, plus two rabbits getting spayed/neutered in the same month is a lot of money. Help??