Legal Question in Real Estate Law in California

I would say there are multiple possible solutions here, and selecting the most appropriate to try first would depend upon some additional facts and situation-specific information.

The possibilities include (1) talking to her again, perhaps with an appropriately-elevated tone of concern and upset, but avoiding anger, to get a better understanding of what rights she thinks she may have to use your road; (2) installing gates, possibly with locks, or with electronic code actuated openers; or (3) you can always get another party's attention to your rights and demands by filing an appropriate lawsuit, which is not always 100% effective, potentially more costly than (1) or (2), and not recommended as an opening ploy in a dispute between neighbors. However, in a worst-case scenario, you can retain a lawyer to file a suit seeking, perhaps, an injunction against trespass, money damages, a judicial declaration of your rights, etc.

Finally, I should caution you to be pretty darn sure that the new neighbor doesn't have some kind of right to use what you think is a private road. Among other possibilities, the neighbor might have a valid claim to an "easement by necessity" or some other rather unusual right to use what you think of as a private road.

I would say there are multiple possible solutions here, and selecting the most appropriate to try first would depend upon some additional facts and situation-specific information.

The possibilities include (1) talking to her again, perhaps with an appropriately-elevated tone of concern and upset, but avoiding anger, to get a better understanding of what rights she thinks she may have to use your road; (2) installing gates, possibly with locks, or with electronic code actuated openers; or (3) you can always get another party's attention to your rights and demands by filing an appropriate lawsuit, which is not always 100% effective, potentially more costly than (1) or (2), and not recommended as an opening ploy in a dispute between neighbors. However, in a worst-case scenario, you can retain a lawyer to file a suit seeking, perhaps, an injunction against trespass, money damages, a judicial declaration of your rights, etc.

Finally, I should caution you to be pretty darn sure that the new neighbor doesn't have some kind of right to use what you think is a private road. Among other possibilities, the neighbor might have a valid claim to an "easement by necessity" or some other rather unusual right to use the road. The situations under which someone can claim an easement by necessity can be researched on line.

If you have given permission, even with a Civil Code section 1008 notice, you have given permission for her to cross your land, but the period during which permission has been given will not legally ripen into a prescriptive easement. I suggest that you speak to a competent real estate attorney near you to first determine whether your neighbor has any valid claims to cross over your land, and if not, the best manner to handle the situation.