Dealing with a complex MLC and/or Wayward Wife #2

[P_Jam]

Hello all,
Question:
Just got of the phone with WW. It is her weekends with the kids and her work schedule changed. She now has to work on Saturday. The kids have football early Saturday morning. She suggested I get there early and help her parents get them to the correct field etc. As her parents will go get them at her place, take them to football, then take them until she is off work at the end of day on Saturday. I told her I did have plans to go out on Friday night, but it might just be easier for me to take them Friday night get them to football and then your parents can take them home after... she was okay with it but was a little reluctant (I'm pretty sure it is only because she would still like them Friday night). They have only been with her 2 nights since she moved out. But she understood my point and was more than willing to let me have them. So my question(s): I do have plans on Friday night (GAL) but I can easily change them. I'm happy to do so to spend more time with my kids. My question is: Should I ask WW if she wants to go out to dinner (all of us) Friday night as a bit of a 'trade off" since she wont' have them? See I'm a bit confused in my sitch as to where more of the focus should be. Should I still be focused on not doing ANYTHING as a family since it's so early? Or is it okay in rare occasions to offer something like this as a way also remind her of what she is giving up?

Now... please don't say - "do what you want, as I should not be making decisions based on her reaction". This I understand, but I'm not there yet. So from a more 'basic' perspective - should I offer dinner with her or not?

Also, my S5 has an MRI on Thursday so we will be spending time together then anyway at the hospital as he goes under anesthesia.. This too will be comfortable as I know I will run out of small talk in the multiple hours we'll be there.

Help!

I've been doing really good over the last week focusing on me, the kids, projects around the house. Even refused to return one of her calls yesterday (cause she didn't leave a VM). She texted today letting me know she called and needs to talk to me. I just said "no problem will call you in an hour" and then we had the above conversation. I'm really doing my best to let her go, remind myself I can't control her - but we seem to see A LOT of each other right now and I want to handle the sitch as efficiently as possible.