I called a tree service, but is going to swing by tomorrow to look. No pictures from tenant as of yet.
Not sure if this guy will be honest about tree condition but yes i was just there about 6 weeks ago. To me they are fine and I feel like legally, that alone is enough to say no, because it's my property and it can be kept to my standards (as long as it's safe).
If it's on the border I might as well get it done if she's paying half. It might have to get done someone soon any way.
As a compromise, maybe tell her that you are going to wait till fall to get them trimmed. Technically you are supposed to trim trees in late winter/early fall or they can bleed sap and/or hurt the tree. I have never dealt with pine trees but I wouldn't be trimming trees in the middle of the summer unless it was a safety hazard or the limbs/branches are dead.
Edit: The tree service is NOT going to tell you that they don't need to be trimmed. They are just going to give you a price to trim them regardless of "need". I'd bet dollars to donuts that she wants them trimmed for aesthetic reasons.