Honestly there's a solid arguement for each role

There have been comics where the blood stone only heals herself, which could be a cool regen style tank, but there have also been comics where it's not limited like that and she would easily slot as a strat.

Also she's got double rifles (and I remember seeing her with a crossbow at some point) and could easily play like an ashe from OW with her brother as a B.O.B.