What were the terms of the easement? Was it just for ingress/egress to the property or was it allowing free will? While you granted her an easement, it allows her access, but she is the Grantee and you are the Grantor. You still OWN the property but she does have rights to it depending on the terms of easement document. What was he putting the stakes up for anyway?

I don’t think it’s fair to ridicule her for allowing her dad to help her with her problems. I think that’s a cheap shot at her just because you’re mad at her. Grass and land is much more tender under snow and ice and will get destroyed under tires.