You can also feed mom sage to help dry her up. It doesn't necessarily dry her up so much as it make the milk taste horrible to the kits, who then basically wean themselves, which results in momma drying up.
Some mother will tolerate the kits for only a short time, and some mothers won't. I had a doe who started humping and nipping her kit at 12 weeks (signs of dominance) so I separated her kit from her. On the other hand, I have an angora mother who stops eating for a day or two when her kits wean (anyone who sees it could no longer argue that animals feel emotion, poor Rue get so sad) and if given the chance will still welcome her kit back and start grooming it even after being separated for months. Just one of those 'depends on the rabbit' things.
Also, keep in mind the more you breed a doe, the more potential you have of shortening her life span. Some heavily bred does only live to be about three years old. Since my angoras are more valuable to me alive ( its the only way they keep producing fiber
) I try to limit my breeding to 2x a year per doe, about evenly 6 months apart. I'd like to see them hit the ripe old age of 10. And if bred responsibly, they don't need retired as soon, either. My angora breeder has a Silver Fox doe who is still producing large, healthy litters at the ripe old age of 8. Not saying don't breed her, just bringing it up as a point.