Having read all your posts, OP, I can see that you made a mistake with your thread title so won't abuse you for it.
What I will say is that a little blood can go an awfully long way - so it might look like a pig has had its throat cut and still only be about 20ml of blood. I used to work in blood labs, dropping one vial of blood (usually about 10ml) took an awful lot of cleaning up and don't get me started on what a dropped blood bag required!!
However, if she is very unwell apart from being in pain (and yes, period pain can be utterly crippling, even after childbirth - some women's periods get easier, others' get worse) then it might be worth talking to NHS direct, especially if her breathing is affected (a sign that her iron/haemoglobin is too low for comfort).
Apart from that, the best thing you can do is keep her supplied with painkillers, towels, drinks, chocolate, something to read, hot water bottles (if she likes those, personally I loathe them) and be as nice as you can to her.