I think you mostly have it right here...no, don't ignore her texts completely but just use discretion as to how often you talk to her about anything other than the kids or stuff you HAVE to talk about. If she by habit calls right after the kids get on the bus to talk about the kids, then answer that. But I would not get into any discussions about the R, or tell her to text you if she wants to talk about it. If you do that, and she ends up not texting or calling you, you'll probably be disappointed.
If she really wants to talk about things, she will on her own...it's not like she'll be gun shy about it because you didn't let her know you'd be open to discussing it. I know it feels like everything is in your hands to fix, and every decision you make will have effects to your relationship at this point, but it doesn't. In other words, saying or not saying anything like you asked above is not going to make or break things.
M-34 XW-32 D-7 Found OM's presence 4/09 Separated 12/09 Divorced 8/10 GREAT relationship as coparents since 8/10