Feeling lost

[srt]

I should also add - how do I deal with W when she behaves like a petulant teenager?

I in the above situation, something is needing to be discussed and resolved, but her response is to get angry emotional and say stupid stuff rather than face the issue?

Up until now I've only been able to back away and raise it again at another opportunity? In some ways, she gets what she wants from this (cake eating) and I'm not sure how to counter it?

I don't mean this as a me v her thing or winning/losing - just genuinely how do you resolve difficult stuff like this when your spouse behaves like that?