Don't worry about taking a step back in this process. It's a text and you can easily reverse this.
I will be tough with you about your text though. Don't use stuff like 'are you available' 'can you' 'let me know' etc etc language - this is all unnecessary. You can be straight forward without being rude.
Getting her to go there to sign it is good, so that you don't have to interact with her. Also, as J said - if there are no kids in the picture, you can really implement NC/going dark. I think that it can be very effective in cases without kids.
