Jewish women don't "uber-bathe" once a month. They merely bathe. These days they tend to bathe every day, but in a world were non-Jews didn't bathe at all, the monthly bath was tour-de-force of sanitation.
There are all kinds of rules about bathing, not just for women.
In this case, it is one of the few times that modern secular standards (bathing daily) are more stringent that religious ones.
By the way, converts to Judaism also "uber-bathe". Christians "uber-bathe", too. They call it baptism.
What is most stunning to me is that she equates the mikvah with stoning and child sacrifice ... obviously she not only has limited capacity to grasp distinctions between very different things, but is inclined to group all things 'religious' into an 'all are equally bad' category -- Something like saying "Jewish women take a ritual bath, muslims fly planes into buildings ... same difference."