Being a truck driver I always prefer to back into my spots. Easier to get out, espeacialy if you need to make a quick getaway. But this isn't about my driving habits.
How old would you say this "woman" is?
I agree with the above post, note on windshield. seems like a good idea.

At college, I ALWAYS back into the spots. Since the rows of cars are so close it is hard to get a good angle, so it really is easier to back in because we dont have rear steer

When you back into a space you know what is behind you. When you back out you never know what might be there in your way.

She seemed to be about 30yrs old.

If I leave a note, she'* going to know who left it because Jen and I were the only ones who saw it.

I think I'm just going to talk to my landlord about it.

Good idea on talking to your landlord, prob the wisest move you could make.

If you were going to help, right at the time would have been best. Then it'* more like "Let me give you a hand" rather than "Here'* what you did wrong"...

I agree that at the time would have been the best time to offer advice or aid. As that moment is gone, how well do you know this lady? Do you generally speak to each other? If so, just strike up a casual conversation, and eventually get to "Oh, by the way, I noticed..." If not, maybe another "at the time" moment will arrive. I'm not sure I'd suggest getting the landlord involved. I'd say either talk to her directly, or just let it go. IMHO