I think there’s a danger of reading to much into this and over-reacting. Which risks creating bad feelings, obviously benefitting no one. Since you don’t own the land and I’m assuming you don’t want to risk creating bad feelings in the community, I’d go with a softly-softly approach.
Usually a situation like this is down to the fact that the tresspasser sees “no harm done” in walking down a trail and they think no more of it. A simple change that makes her aware that she shouldn’t be there is all that’s required.
I would put up signs along the trail she is using stating “Private Property”. Don’t affiliate it with hunting and don’t identify yourself or do anything that makes her know she is the target.
My feeling is that if you put up 3-4 signs along the trail, you won’t see her again. Problem solved with minimal risk. Don’t use an elephant gun to swat a fly.
Grouse