Here's my take Drew:
If she has legally filed for divorce,I feel she has the right to go on with her life and be happy. Her soon to be ex sounds like a total sponge and loser since he's been out of work for years and refuses to get a job,making her go to work to support everyone. He needs to man up and go flip burgers or something. I've known women who've ended up with abusers,bums,moochers,etc. There's no reason whatsoever for them to stay in an unhappy marriage like that.
As to the "ready made family" thing,I'm not sure how old you are,but at my age (49),finding a woman who's never been married or had kids is rare as hen's teeth.
She may be a wonderful woman who just wound up with the wrong guy. Maybe you two are destined to be together. I say if all loose ends are tied up,go for it!