AITA for telling my neighbor if her new fence is on my property I’m going to ask she moves it.

I have historically had a good relationship with my elderly neighbor. We have always been nothing but friendly with each other . We own hillside homes in Southern California. Each worth about 1 Million in today’s market.

Last week she told me she was going to fence her yard because she doesn’t like the high school kids down the street trespassing. I told “go for it”, all I ask is keep it on your property.

This week the fence was completed. She flagged me down in my driveway today and asked me what I thought of her new fence. I was honest with my concerns and let her know the contractor installed the fence several feet to the south of the sewer grates which I believe is several feet on my property. Per my title records we split the easement so I thought it should be placed on the north side of the sewer grate on her side. (Fence was installed in one day and all took place while I was at work, I had no time to pause it while they were building or I would have said something).

She kind of shrugged it off and told me she doesn’t think it’s placed wrong. I told her due to the expense of land in our area I would be scheduling to have a survey done to confirm the fence is property placed. I informed her if it was off by inches it wouldn’t be a problem but if it’s discovered it’s several feet on my property I would ask it be moved.

She seemed kinda surprised and irritated that I would request the fence be moved asking if I would be willing to just live with it due to the expense. I informed her due to the small yard and expense of land in our area I don’t think that’s something I would be okay with. I kindly informed her I think she should have had a survey done prior to fence placement if this was something she was concerned about. I don’t think I should donate land I pay for because of her error.

TLDR: Neighbors new fence appears to be on my property. I’m getting a survey to confirm. Neighbor is upset I’m getting survey and says even if her fence is on my land she asks I don’t make her move it.