- could you also show this bit for the text you’re trying to set (What’s in the Bind? Is there anything there?):

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how and when is
SetHealthBarcalled? You’re not storing a reference to the widget, hard to imagine how it’s called. -
what calls Start Game?
Potentially irrelevant at this point but, from the design point of view, is there a reason why the Player Controller creates the health bar widget? Isn’t Annie more than capable of handling her own health updates? Do tell, you may be juggling a bunch of characters and have a good reason for doing it in the PC. It just sounds counterproductive.