I did read that " those 3 hours took me away from interacting with children which is what I'm employed to do."
I also read " we are operating......with the bare number of staff needed for ratios and cover for our (unpaid) lunch breaks"
I therefore deduced that although OP is not doing what she is employed to do, their employer is maintaining the number of staff needed for regulatory ratios.
I too don't get paid for my lunch break, no-one does where I work. Contracted hours are 8.30 to 5 Mon - Fri (which would be 42.5 hours) with one hour for lunch but the contracted payable hours are 37.5 per week so hence we're not being paid for our lunch hour. Do lots of employees get a paid lunch break ?
Please don't mis-understand me, we used a fantastic nursery for our dc and are still in contact with some of the long term staff there all these years later. I know that the regulatory ratios are the bottom line, not a fantastic ideal environment, but we are in unprecedented circumstances in 2020.