Eh, I'd say this goes in line with what was established about her character.
In both Eisei's rebelion and Battle of Ryoyou she used herself as bait even tho the risk of dying was huge. It's best to wait until we see full context before making judgements.
I regard YTW using herself as bait as having always been rooted in strategy, and consider Ryouyou as the strongest evidence of that.
Even though her men starved and Rozo and SSJ had enormous advantages (in numbers, quality of soldiers and terrain familiarity), YTW nevertheless completely outplayed them by using herself as bait - a decision guided by her strategic aims, not a desire to minimise the loss of life to her men.
It was her strategy to monopolise their attention and make Ryouyou open for the taking, and victory soon after.
It was because of her strategy that Rozo got packed up and SSJ lived the humiliation of not only losing but getting effectively benched until the very end of the war.
YTW's background does not make her unfeeling towards her soldiers dying, we know it's quite the opposite. It is precisely because she values the lives of her men that YTW has never taken her eye off the ball in any of the battles mentioned.
That she would do so now, in this context, and especially at this pace - I just don't buy it. I'm open to a difference of opinion, but that's all that it can be to me.
I'm personally very negative on YTW getting struck in this context because it feels completely unearned and manufactured. Fiction is contrived by nature, yes, but its quality is most commonly judged in how well it obscures that fact. My view is no different, and I don't think Hara has done a good job of that with any consistency in a very long time.