She’s fixated on her deceased husband. She has history with Zib. She made an attempt at something with Wick (though it didn’t go at all as planned), and Rocky chases her approbation with unsettling application of zeal (arguably, something he’d do for anyone who’d give him the time of day). Certainly not all of her associations (Viktor, Mordecai, Asa, Freckle to name a few) have a romantic slant, but that’s beside the point. Mitzi is a central character who pursues and maintains a complex of relationships in a criminal, male-dominated business. It’s rather the crux from which the story branches.
Does that seem problematic?