Tup, I thought I'd already replied to this but it appears not!
So very sorry to hear about your friend - can't imagine the despair of losing so many precious bubs & not knowing why.
I've had 4 m/c's & recently had recurrent m/c testing. Turns out my DH has sperm issues that are the cause. Her & her DP need
to be tested (he needs something callled an scsa test - not just a regular semen analysis).
Hope something turns up for your friend that is fixable & that she gets the bub she sooo deserves. Big hugs xxxx