The doe needs to have been spayed at least 2 weeks for her wound to heal before introducing her to the buck. IF she is very feisty it could take longer for her to become less hormonal. But if she is a sweet rabbit then it should work after a couple of weeks. I usually wait for much longer than 2 weeks but it isn't always possible to keep 2 rabbits separately. I wouldn't let them meet through bars, as this makes them aggressive and when you do introduce them it has to be in a neutral area so there is no territorial behaviour. Good luck.