Continue to focus on you. I haven't seen anything from her worth taking back yet....have you? All she has is snidely comments about what hasn't changed about you. You have made the changes, you aren't doing anything wrong, she's just trying to tear you down. I was divorced for 4-5 years or so and remarried and my ex still said something about "not changing" or "I'm reminded why I divorced you". My bottom line is don't hold your breath waiting for her to come around....it could be awhile (or not at all). She'll make a big leap your way if she's interested...she won't make it hard for you to decipher. Since she still has self-work to do...what's your hurry? You can afford to just float along for awhile and forget about her for a bit. Keep reminding yourself when she makes little snippy comments that it isn't you that has to win her back....it's her needing to win you back. Making comments like that I hope isn't your thing. Be confident. Strut your stuff. Remember you aren't desperate for her. Then you won't necessarily even have to think about her mean comments or what they mean to you....the only words that count from her are "I'm sorry. I never should have left. yada yada".
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer