Sorry to hear you're going through this. Making the leap to NC can be a shock, especially if we are trauma bonded, have codependency issues, or low self esteem. I'm not saying any of those things are you... .detaching and leaving is difficult. I've been there before (and still am!). I'm about a month NC with my ex (who I work with... .as well as my replacement, and she is dBPD).
You're still experiencing FOG. It just doesn't lift, it takes time. Don't worry about how she's taking NC. NC isn't a punishment for them, it's a healing tool for you. It gives you time/space to heal without their influence clouding your judgement or your own issues preventing you from healing by being around them.
Congrats on the first step on the path of healing! You're doing fine... .it's a brave new world! Welcome!
