Can I save my marriage? (long; please be patient)

[MadeToSucceed]

Ok...so there's a development and I'm not quite sure what to do with it. My grandfather and my W always had a great relationship and it has pained him that she hasn't reached out to him during this process. It is natural that she wouldn't IMO. She doesn't want to deal with the guilt.

Well yesterday, my grandfather (we, including my W, call him PawPaw) tells me he called and left her a voicemail. He told me he said to her "Hey W, I hope you're doing well. This is PawPaw. Just wanted you to know that whatever happens with this thing you'll always have a special place in my heart and you'll always be my #1 granddaughter-in-law. Take care. Love you." Now the irony in this is that my W is his ONLY granddaughter-in-law but you get my point. I wasn't upset or anything when he told me because he's grown and he can do as he pleases and I didn't really see anything wrong with the message. I didn't instruct him to do it (although I could see how she might perceive it that way). Anyways...here's the development part.

This morning (about 30 minutes ago) she just text messaged me:

"Your PawPaw called me at some point yesterday. Left me a voicemail. I appreciate he and your mom reaching out."

Now earlier in the process (back in May), I know my mom reached out to her via text in similar fashion. I guess I just don't know if I should respond and if I do, how.

Part of me wants to let her know I didn't ask them to do that because I didn't. Part of me wants to ask what was said (even though I think I know what my grandfather said). I don't know. This is the first time she has contacted me on her own and not just been responding to something I've sent but it's about something in particular. Should I respond and if so, how?