I think it's because she still wants to show your kids a good time, regardless of how things stand with you 2. It is definitely possible for not only her but for you also to compartmentalize activities with your kids. Whether you ultimately work this out or not, you 2 will still be parents, of course, and activities with the kids together can work out just fine, and even great. I fully admit that I am probably in the minority on this, but my ex and I have done all sorts of things together with our daughter, even went on a vacation, to the circus, festivals, disney on ice, movies, picked blueberries, etc. You name it, we've co parented it. For our daughter, but also for us as still two people who are very close but who just couldn't quite get through our problems.
Regardless of my situation, just know that a family element can still remain very strong throughout all of this, and that looking ahead to a fun activity in February is not unheard of at all.
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