zen, i think ur friend's infection is not just yeast infection..
i tink its group b strep bacteria, if mummies have it when delivering baby, it can pass to baby and can be quite lethal.. i took care of many such babies who had this GBS infection, sadly all died...
but it can be detected, ask ur gp about it, and i think a few weeks b4 delivery, they will do some swab or some other test to test for this GBS, and if positive, can take antibiotics.. very important, so all must go ask their gynaes about it k... i do not think its a routine check..