Arrival to NC.

[mvgfwd2]

I think you have various ways to deal with it:

You could automatically have here texts go to spam folder where they sit in a separate folder until you want to see if there is anything worth responding to. If it goes to spam you won't even see it until you open that folder. When you aren't responding to the garbage anymore she will eventually stop.

You could say something like "I've met some new people so I won't be able to chit-chat anymore, except for the dogs". You have met new people but of course she will assume a female. Let her stew in her own insane world. I like this approach because I have a little devil in me.

You could just flat out say "you are divorcing me and you are in another relationship, I don't want any part of that and have moved on, please keep the communications to just about the dogs"

etc.

combine the spam folder with any other option for optimum peace of mind.