If by including the extra red you are counting on a bad board as a win condition, I’d argue that a bad board is one of the win conditions for any rainbow team as well. What’s more, her lackluster ability doesn’t punish as hard damage-wise for slow starts as any of the most commonly used tanks. She also lacks a heal to sustain her, like Guin/Del/Aeron.
There is a term in collectible card games called win-more. This term defines cards that are primarily effective when you already have a lead. They do little to turn a game in your favor if you’re even or behind, but can turn a presumptive win into a misleadingly strong blowout. I sincerely believe her to be more of a win-more hero. If they stack against her and get off to a very slow start, those are games you should be winning anyhow With or without her albeit perhaps not by as wide a margin. These wide margins are deceptive in analysis of a heroes effectiveness, because the blowouts are going to be the ones that stand out the most and can therefore lead to false conclusions about efficacy