You have to stop asking her to do things with you, no matter how small or unromantic they seem to you. It just gets you into a tither (look at how excited you are just because she said "today I can't). You are reading into things that don't need to be read into. This is not a small victory. This is her being polite.
I look back on the last 18 months, and I know that when my H was nice to me it was either because he thought I was slipping away, or because things were going well in his life. He was dating and texting other women while he was doing me favours like tidying up the garden, giving me lifts, and generally being nice to me. And I would say to myself, see he, is being nice to me. Maybe he is thawing. But he wasn't. He was just scared of losing me or things were going well in his life and he thought he had the wool over my eyes.
I am not saying that is what your W is doing. I am just saying that not everything is always as they seem. Focus on you. Leave her to her. She will find her way, and if she wants to come back she will.
You may think you are listening to us, but you aren't. You are still allowing her actions and words to dictate your actions and words.
How are the kids? Are you any closer to moving closer to them?