I've been wondering this for a while, and since I'm writing a fic about it... Merope and Morfin have a horrible father, but what about their mum?

She's either dead or divorced from him/separated. I'm kind of leaning towards the former, since I'm guessing the latter didn't happen much back in the days. But I could be wrong.

So, questions:

What kind of woman would Merope's mum be? (Pretty, nice, whatever? Bearing in mind that Merope isn't exactly described as pretty)

Dumbledore mentioned something about the Gaunts marrying their cousins; in this case, do you think she was Marvolo's cousin? If so, would it be likely to be first, second, third, once removed, etc?

If you think she left him, why did she marry him in the first place? (Assuming they're married, that is.)

If you think she died, is there anything in canon which says when?

Could she have died in childbirth?

I am honestly unsure at the moment, and I don't know if canon contradicts any of what I'm asking, or if I have free reign, so help would be appreciated