(Ok, bunch of posts submitted since started writing this, but whatever, not wasting all that thought so just hitting submit...
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Not worth arguing about... it already was, and generally is, the background history and was going to remain the history. People make split second decisions, sometimes they aren't for the best. Clearly the action that seemed most urgent to her in that moment was trying to help her husband. Urgent enough that other help would never be there soon enough. Yes, she left her child alone, but she didn't have any reason to believe anyone would run off the baby, who she left at a safe distance because there was no other choice. Even if Saki was fighting with Yoshi, given her recent interactions with Saki, she had no reason to think that he'd take her child. (Besides, if the kindly Yokai were around maybe she thought her child would be guarded.)
Of course... weirdly, if Saki was under the impression that Yoshi also died...it's not necessarily ill intentioned to take the child with him if she was laying there alone and orphaned. It would be more cruel to leave her there. Though he should have sought out the child's other blood relatives instead since he knew the truth. Selfishly held on to that connection to Tang Shen, but probably(?) not intended badly or meant to be held against anyone...until he found out he could years later.
It's history and was going to remain history no matter if her choices were wise or not. No "feminist rants" or accusations of it necessary. And honestly not sure if too many guys should argue what a well written female character is or isn't.