That's awful about her sister, I hope she is on the mend.
As for domestic abuse - I've been following Rosie for God knows how long, since she was making YouTube videos, and looking back it kind of fits.
As far as I remember she moved into his house whilst still at Uni. So 20, 21? And immediately seemed to take up this house wife role. She then seemed to go straight into blogging and as far as I can tell was financially dependent on him basically forever.
She always just seemed completely devoted to him and he was quite a good bit older and more established than her. The fact that he left the moment she got a sniff of independence kind of says it all IMO. You're going to walk out on your wife when she's a term into her much longed for career change? After she's clearly supported you for so long? Mmm yeah wouldn't surprise me if he was total douchebag all round.
I always got the impression with Rosie that she was absolutely desperate for a traditional family life, to be a wife and mother. Then it seems like she wanted something more than that and the marriage fell apart.