She doesn't think she needs therapy. Why? Because there's nothing wrong w/her (in her mind). I wouldn't have any more discussions about her going to therapy. You can't argue w/an irrational person. If you think you need to seek out some therapy, then go...but it's best to let things be w/her about this subject.
Try not to "assume" anything when it comes to her comments/actions. I think she told you quite a bit about what she is doing, which makes me think that guilt was helping her lips to move freely. But, we can't assume that she'll be anywhere but where she said she'll be at this time. Time will tell.
I'm sorry that you'll have the kids while she's out and about, but I'm sure you'll come up w/some entertainment that all of you will enjoy. BTW, do you have a reliable sitter? Maybe get a sitter for a bit if you feel the need to get out and have a breather from taking care of the kids. There's no harm in that...just like mommy, daddy will need some time to himself as well.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.