Where do I go from here?

[NewB3]

Last Sunday Ex asks me for a favor and to come to drop off S4 a litle early. She wanted me to come cut out pictures from school. She has never been good at that.I arrived, cut out pics as she visited with S11 and S4. After I was done S4 wanted to play and we got out a popular kids game. We all played for 30 minutes. She sat next to me. After the game, S4 being silly, let all the small balls fall on the floor. We all helped pick them up and every time I would have her a few, she would raise her had to take them, but would touch my hand. (to make sure I would not drop them? ;))
40 minute visit.
She has family in town next week and asked if we could come with them to dinner and then on the weekend to go do a festival thing in the morning. I have S4, but she wants us all there.
I feel she is carefully reaching out. I know she misses me, I can tell. I am confident, being a great father, letting her some to me, and talking to several other women. I feel great, but do notice that when I am around her, I feel it too.
S4 wanted to send her flowers for mothers day. I ordered them and she got them Thursday. The card was from him and so was the note that I dictated. However, she sent me a text and said thank you very much for the flowers. Instead of a simple "welcome", I did not want credit for the gift, but the acknowledgement was nice. I simply replied..."Happy Mother's Day!"

S4 mention to me this week after school "It was fun playing the game when you took me to mommy's house. We got to spend time together as a family! I told you mommy misses you. We had fun (thumbs up/big smile). This floored me, but I kept calm and just smiled.

I do not know what she is thinking, and she does not know what I am thinking. I have to take this SUPER slow. I am continuing my GAL and I feel she is noticing my 180's have stuck.

Looking for some solid thinking on my situation from you.