My New Scenario

[Newly20]

So despite me stating that i was not ok with D3 going to MIL/FIL house, W decided to take her up there anyway. She said she would bring her down on Wednesday. So we got into it a bit back n forth via text, mainly me stating my discontent with her doing this. I did tell her i was not trying to keep her away from her family but that our communication needs to be better and that we are both parents, we should both be in agreement. We switch off on weekends and during the week D3 spends time with both of us, i told her we are 50/50. She went into it on this and said that we are not because our D3 sleeps with her and that we will let the courts decide this. We kept going back and forth, I didn't lose my cool even though there were some instances where i wanted to just let her have it. I tried validating where i could. At the end i did pursue a bit and told her she was confused, to which she responded that she has already filed for divorce and she was certain about what she wanted.

I'm still processing this, i have not totally lost myself emotionally nor do i know how the coming days, weeks, months will feel. I have not responded to the last text about her already filing, and I'm not certain if its a bluff. Only time will tell.
Should i respond to the text and validate somehow? What should i say

Moving forward, how should i approach my situation. This whole ordeal has just took a huge turn in the matter of a weekend it seems.

She also mentioned that she was bothered by the fact that i could not even answer her phone calls, she stated she doesn't care about my personal life and that i should not have reached out to MIL for 'help'. I strongly agree with that.