Well, I'd say your mother had some issues just based on what you've said.No I am trying to understand it. My mom drove off and left me 3 times that I can recall in stores when I was a in the 3-4 year old range and 1 time I was the only person with her. the other 2 i can get because my brother was such handful to deal with 24/7. The time it was just me, not so much.
Two small children one year apart might as well be twins. They are virtually twins and yes they can be a handful but no I wouldn't say it's an excuse to leave them locked in your little convection oven of a car all day.
Not ever would I say that or use it as an excuse.
My mom had 7 kids in 10 years. She apparently liked my dad's wiener