...you may want to dive into the “police” power of the state.... no $$$
I think the owner, who owned the property prior to the ordinance, has the basis for an illegal taking claim. With the amount of money involved if the municipality has to reimburse her for the value of the natural gas, she may be able to find a lawyer that will take it for a percentage.
Looks like the municipality has its butt hanging out on this one. She may end up owning them if she finds the right lawyer.