WW in MLC in need of advice-Part 2

[Natash]

Well the party went well and was a hit. The weather, food,friends and pool was great!

On a different note, WW has kicked it up a notch today via texts and I believe she is hurt that she was not invited to the party. This afternoon while working I got a text
WW: D5 has a dentist appointment at 4:30, do you want me to bring her?

Tomorrow is my day with the girls so I simply respond "no".

WW: No...thank you?
I guess answering her question with a simple no answer was not polite enough.
Ww: You know this whole time apart has made this/us worse. You comment the other day was you weren't looking for us to get back together. This isn't making me feel what I'm missing or wanting to come back. Instead it's the complete opposite.

The comment she is referring to is my response to her "this isn't how you work on getting someone back" and I agreed and said that's not what I'm looking for (I need her to show remorse and work to come back, not the other way around and me get her back)

So I'm at work and can tell she wants to get into a text convo which would lead to a R discussion. I almost responded "I'm sorry that you feel that way" but held off and wanted to bounce it off the board. So just recently get a text:

WW: I think maybe we should figure out maybe being done.

Ww:I don't see this going anywhere.

I haven't responded for a few reasons. One this is a night the girls are with her and she should be focused on them. Getting into a R talk when they are awake is not fair to them. I also want to come across strong and confident and in a way that she sees I'm letting her go. I don't believe divorce is the answer but I'm not going to help her with it nor stop her.

Do I hold off and respond after the girls are in bed or ignore the text as it does not have a question?

I feel she wants to express her feelings and is still having a difficult time starting an adult mature conversation telling me how she feels so she does it with these quick texts here and there.