Yes, I think you've hit the nail on the head. I imagine a lot of what you described went through her head. I certainly understand that there would be conflicting thoughts and I understand why she didn't follow through.It's not only for attention.
She may have strong desires to go down that road and felt confident that she could pull it off,
only to realize she couldn't follow through with it. Guaranteed there was a good space of time between the first thought
and eventually contacting you.
The marriage is still young, just had a baby, that's a huge threshold to cross, guilt, confusion, emotional turmoil.
This board cultivates an enormous amount of cynicism, most people are good and try to live up to their values.
When she first met her boyfriend (now husband) she was still seeing me as well. Once it became serious with him, she decided to end it with me because she was looking for a life partner. I was just offering casual fun.