No one ever metal detected it too, used it to host meetings for churches sometimes
Curious how you know that "no one's ever metal detected it" ? I dunno about your geographic area, but where I'm at: Every single one-room school site like that (that is no secret to research) has been pounded. Even if the current owner or caretaker doesn't think so.
As far as "used for meetings and church", that's a good sign. Because if it was/were strictly one-room country school house, and if it ceased to be used after 1940-ish, then .... I didn't want to be a kill-joy but .... sometimes those have little to no coins. The old addage of "kids didn't have coins/$ in their pocket " (in the depression and prior) is largely true. It wasn't till after WWII that prosperity increased to where every kid had a coin or two jingling in his pocket.
I've hit many 1-room school house sites that date from the late 1800s to the 1930s, and found zero coins. Yet we did find rivets, buttons, suspender clips, lead, copper, etc... which told us the site hadn't been hunted. Yet little to no coins. Or strangely ... if the school site had been active up to 1950, you might get a few late 1940's-era-losses, yet nothing from the earlier (1890s) era. Again, meaning the demographics changed highly after WWII .
But if you say it had cross-over usage as grange-hall, church, etc...., then that means adults mingling about, and better odds at fumble fingers coins.