It's doable as long as you are still feeding her enough. I have had a couple that would only eat mice and I typically fed them a lot of mice every two weeks. I live 20 miles from a pet store and don't want mice in my house. They did just fine being fed every other week, but I really made sure to fill them up!
There have also been times that I was feeding my adult females every two weeks because I ordered rats that were a bit too large for them.