In a way, this sounds like an
extinction burst of... the silent treatment.
You're right on the money: in the past, you would be the one resolving the silent treatment. Now, you're doing something different, so naturally, she is doubling down on what worked for her in the past, to see if she'll get the same results. Kind of like if the elevator button doesn't work like it did yesterday, you hit it faster and more today.
Your relationship had a pattern where she would rely on the sequence of silent treatment ---> husband approaches and initiates talk ---> she vents and chews you out ---> she feels relief after "emotional vomit"
She would rely on you and your behaviors for emotional self-soothing. That wasn't healthy for her, for you, or the relationship.
Making changes to your pattern will be difficult and uncomfortable, for both of you. Yet it will be healthier for her to flail around for a bit and find a way, on her own, to self soothe.
This won't happen overnight. It might take multiple repetitions. The key will be for you not to, out of discomfort, resentment, fear, anxiety, etc, go back to "I can't handle the tension -- I'll go to her and grit my teeth and take her outburst so we can move on". That would just be communicating "Dookinfick will do the same thing he always did, it'll just take longer".
Another key will be reframing the situation away from one of resentment and imputing motivations, and towards decoupling from her emotions and choices.
Old: "She's trying to punish me by the silent treatment... and it always has to be me taking the hit to get back to normal"
New: "She has low coping skills for emotional regulation. Her not talking to me is the best she can do at the time. That's her thing, not mine. We each get to take time apart when she chooses not to talk. I'm looking forward to a break and doing something I love to do!"
...
So now we're on week 3 of not talking and I don't really want to do anything for Father's Day since she will only do it to make herself look good to others...although she has sabotaged previous Mother's Days by leaving the house for the day so we couldn't take her out anywhere, leaving me to explain to the kids that "mommy isn't feeling well."
What if you decoupled what you wanted to do on Fathers Day from whatever her motivations might be?
What if you did what you wanted, and allowed her to impute whatever she wanted to the situation?
Your experience of Fathers Day gets to be your independent experience. She can do and think and say whatever she wants about it -- that has no impact on the reality of it.
If you
want to go to a water park with the kids, for example, you can say "Hey babe, we're doing the water park for Fathers Day! Would love it if you came along -- no pressure." And then allowed her to navigate that however she chose. She might say No, that you're being a selfish guy who only wants to look at women in bathing suits. Does that define your reality? She might say she'd never go, and then at the last minute, show up with ice cream for the kids. You can decide if you want to tell yourself "she's just doing that to make herself look good" [which is allowing her disorder to take the lead and your thoughts to follow] or "who knows why she's doing what she's doing, I'm having a great time with the kids".
Powerful stuff.
Anything seem on target?