It's not so much a victim card, she don't really have to say anything. Everyone in America and most the world knows Bill is a dog. Hillary is stronger for suffering silently and trying to keep her marriage together.
If Trump were like the 40 year old virgin or was a widower, maybe he could play up this line, but he's been through a number of women himself. If we have to judge between the two of them on their personal marital situations then Hillary wins because she at least tried to keep her marriage together, but Trump cut and run.
There's better ways to tackle Hillary from the side of Trump. Just the Iraq War vote alone would be a more effectual attack line. If Trump wants to get personal with it, he'd be better off going on health as he is in supposedly in peak physical health, whereas we know Hillary has health issues.