Ugh! Wait a second. I misunderstood. I misread and thought you were the landlord.
Be careful. Unless you know the landlord and know she's trustworthy, you have no protection in paying for a service through p.p. If she takes the payment and absconds with the money and there's really no rental property, you're SOL.
I'm not even sure whether a credit card will protect you. Before sending her anything, check with your credit card company to see if you'll have any protection.
You might want to do a little research regarding rental scams just to know what questions to ask and make sure this is legit.
https://www.paypal-community.com/t5/Refunds-and-cancellations/Vacation-Rental-Scam/td-p/595793?profile.language=en-gb
http://www.tripadvisor.com/ShowTopic-g34345-i53-k4324975-Good_article_on_potential_rental_scams_frm_Keysnews-Key_West_Florida_Keys_Florida.html
Have you seen the property?
Do you know that the landlord is the owner and has the right to rent it out?