I think there was an interview with Nate Feguson of P1 Tennis in which he addressed this. The women don't see the need as much as the men for customization/normalization of their frames. Players like Henin were known to keep the same frame and change paint, but I would guess Wilson's pro room handled her frames for her. Other female pros have been reported to buy their frames off the shelf.
The two most prominent female pros, the Williams, have pretty much been all over the place with frames. They played with OS game improvement frames for a while and now play with more a players' frame. It was reported at the AO a few years ago when Serena played with a backed out frame that she played the entire tournament with one frame. The frame turned out to be a frame Wilson asked Federer to hit with and Serena loved it.
Wilson Six.One 95 16X18 Synthetic Gut @ 60
Strung Weight 358g 359g Balance 31cm 31cm