I guess it's a two way street. You're feeling judged for wanting to stay at home, while ranting (your term!) about working parents "dumping" their kids in day care... That COULD be taken as an insinuation that you are equally judgmental of working parents...

Ultimately you have made your decision. If you are confident that it is right for you, nothing anyone else says should be water off a ducks back...
To be fair, you told her that you weren't going back to work and at the end of the post you said you might go back part-time or take a day to yourself.

It's that balance that she may have been alluding to. Personally, I think working part-time or having some time yourself just as you've described is essential. I need it for my sanity, though my partner often works weekends and isn't here for dinner/bath/bed so our circumstances are a little different.

What really peeves me is when women say they are going back to work because "I was bored at home" thereby implying that there is a lack of things to do at home. My friends who've gone back to work full-time have finally fessed up that it wasn't to do with the money, that being a SAHM is just bloody hard work.
I've never before had a problem with working mothers, until now, when all I get is judgemental comments from them. Perhaps it is jealousy. But it's certainly not what they're saying. I DID title it as a rant.

Also, I didn't tell her that I planned on maybe working part-time one day. I simply said 'no', before being interrupted.