There's a germ of an interesting idea here. Like the idea that Diana's so selfless she doesn't give herself time to dwell on her own problems COULD be an interesting thing to reveal/explore.

But I'm not sure about this execution. Feels too extreme and paints it as almost pathological.

It reminds me of that JLA issue Chuck Austin wrote where Wonder Woman had an abrupt and out of nowhere break-down after a fight because she was so terrified she almost died even though...she's Wonder Woman.
It came across like an effort to inject depth/pathos from someone who knew almost nothing about the character, so he latched onto one idea and bent the story over backwards to justify it.