yes, both mine and my dd's were awful.
went on the pill eventually myself at 18+. my mother was the no intervention kind, and only had mild periods herself so didn't understand.
my own DD is on the pill at 14 - no one should have to stay out of school and be unable to do sport because of painful, heavy periods.
@Hoolydooly, I see you hope that intervention is unnecessary....
Intervention is fantastic - i wish i had had a mother who could sympathise with something as debilitating as heavy periods, and that she'd got intervention for me.
you lose so much ground and confidence as a woman if you have heavy periods. Having to 'struggle through' gives girls the idea that their health isn't important and that they should put up with crap - that their concerns aren't to be taken seriously.
Intervention can really turn a young girl's life around, and while i understand your feeling that you hope intervention wont be necessary, it can be so damaging to keep your head in the sand and deny a child a healthy adolescence because you wish the problem away, and minimise it because you didn't have it bad, or you're "waiting to see" if it resolves itself in a few years - (that is when her childhood is over and damaging self esteem patterns have been firmly established.).
I am glad that your DD is having blood tests, but I'd push for her going on the pill asap, so she has a normal childhood and can engage in her life at maximum capacity.