Divorced and moving out.....still hopeful

[NewB3]

went last night to get some more stuff for S3.5 from her home. I had a toy for the dog. He loved it. Made her smile and S3.5 was full of hugs.
She is getting sick and will not go downtown. She said she does not want to be around a lot of people while sick. She followed with, if you were going to be trick o treating in your neighborhood, it would be different. I gave no comment. I had brought in his school pics. She asked my to cut them and said that she did not want to do it as I always had. "you do a better job than I would." she said as she got the scissors.
As i was leaving (btw, car was washed and clean. I was in shirt and tie) S3.5 was asked to give me a hug. I picked him up and held him, he then leaned over towards her for a hug. Ended up a group hug. He then got down running in circles around her saying " mommy was crying and that was a joke." He kept repeating that he was telling a joke. She must not have heard him, because she informed me that by joke he meant he was telling the truth. She corrected him.

. I am kind, but distant. Try joking a little to make her smile and keep it lite. I do not touch her. I make little eye contact, but am very confident. Stick to business.
Her actions when I leave are like she wants to spend more time talking and looking at me. ( see previous post about leaving) S3.5 has said she cries and misses me. She verifies his "joking" is him "telling the truth". She has not reached out in any way.
So what do I do to keep her interested while she misses me? Do I act interested or keep holding out on communication and being dark as possible? If she is crying, is that doubt creeping in that she made the wrong "gut" decision?