Yup, I know what you mean - I guess I should've asked a little differently - When she asks pointed questions about the changes she's seen, I can't "detach" and deny them - I have to answer "professionally".
Thus far, I've just told her that emerging from depression and being jolted by our failure has caused me to reevaluate my priorities. Basically, just falling back on the truth.
I've gotten plenty of "why not 5 yrs ago" from her, and deserve it, but haven't come up with a better answer, and "I don't know" would just be dismissive and insulting, possibly leading her to think I'm still out of touch, or happy to be rid of her. [For what it's worth, I am happy to be rid of the uncertainty of her feelings - it was a 1000 lb weight around my neck every day.]