That didn't actually exist. Two separate excavations never found signs of anything under the school except for a small crawl space someone had dumped some trash into.
The mistake you're making here is assuming that all of the accusations in that report are corroborated. They aren't. Most of it is just a collection of claims made by assorted people, not anything to do with actually investigating those claims.
> And we could put a cellphone chip on it, and it could telemeter out to the doctor or the patient what was going on.
It's very doubtful she understood how any of that works, or would work in her product/patent.
Underlying story seems it's absurd this was patent-able.