There are a few different approaches to bonding, some people try out the softly softly approach, which is kind of what you're suggesting, putting the cages near each other, maybe swapping some bedding around etc until they are familiar with each others smell etc. It's if you let them see each other and then not see each other and repeat that it can become a lot more difficult to bond them. Crunchie is correct that when she gets her hormones in she might start to get very grumpy with him!
I did a similar approach with Molly and Faline as I had never bonded before and didn't really have a separate area for a long term cage for Faline. I actually bonded Molly and Faline before she was spayed. She was about 12 weeks old and he was already neutered, I bonded slowly by the cages being near each other for a while then put them in the bathroom together for the proper meeting then when she got to about 6 months old took them both in for her spay. I just monitored them really closely whilst she healed. I could tell when her hormones kicked in as she started humping Molly. (Molly is a boy btw) :lol: