Where do I go from here?

[NewB3]

Update and questions
I had both kids this weekend. Good times. Busy Saturday morning and home that afternoon to do some grilling as they played outside. We had a big dinner and settled in for a movie that evening. WAW called Sunday AM to talk about drop off, as we do not have a set pattern, just time.
Her first question..."How's it going?" (notice the change here?) "Do you have a minute?" We talked about how my weekend with kids was good and no issues. She said that is good, maybe he will be better for me. I inquired. She said he is still lashing out at her. I showed empathy and tried to be a little easier on her. You see, she usually starts out the conversations with the "Are you busy/do you have a minute" stuff. However, since I started letting my wall down last week and trying to be more friendly, she seems to be more relaxed. My Therapist says that I tried to give her so much space after the holidays, that I put up boundaries that may be more than I think. He suggests I give her some space still, but try to make her reaching out acceptable. He said if she does still have any inkling of interest, I need to be more "available" to her. I do not need to pursue or anything, just try being not so guarded and robotic with my boundaries.
I sent HVD cards last week with pics of the boys. One for her from the little one and one each for the boys from me. Well, hers arrived early. She called this morning...the conversation went like this
WAW"hey, how's it going?" Me "good, how are you?" WAW "do you have a minute?" Me "yes, just driving to work." WAW "I just wanted to say thank you sooo much for the wonderful card." "It is such a great picture of him smiling and the words on the card are so sweet." The font/color are so pretty. " I just wanted to tell you thank you." Me "you're welcome, but that card is from him." WAW "Wel, I know, but I did not show it to him." "I knew if he saw his picture he would say it was his." "I did not want to get it messed up." Me (thinking of mentioning his card is on the way, but did not) "Glad you like it."
We chatted about her soon to be trip and so, trying to be nice, I asked her about it. She then became chatty about where and the place, and such, I tried to sound interested and tell her it sounds like a great place, etc. She made sure to tell me that her and her sister are going. Although I did not ask anything about who. Before we got off the phone, she once again said "thank you so much for that card, I just wanted you to know I loved it." I told her, you're welcome. She then went through his schedule for this week, which we both know it very well by now. I feel she was reaching out and just threw that last stuf in there to cover the card gushing. I feel the main reason she called was because of the card. She has not thanked me for anything in a long time. (see first/second threads from last year)
Am I doing this right? Am I showing enough interest? I am letting her come to me and being more personable now. It comes easy, but I do not want to over-do it. I have to remind myself that she may not be anymore than 51% interested. Acording to Corey, that means I have a chance, but be very careful.

What do you think?