the only way to know is to ask..
She is sending you encrypted messages, maybe about you or about her mood. Be careful about not confusing things.
If you want to ask, be subtle.
Well my dear freind I am afraid you have just been zapped by the lovely mixed signal network of our lovely female species, I guess if the titles are making you think then she probably is sending you a hidden message, you could be cute and send her a few of your own and have a bit of fun but finally you will have to get to business and ask her either directly or in a slight curve ball manner ; )
good luck and enjoy the mystery of not knowing it is one of the most exciting parts of a relationship so have fun while you at it : )
Did you listen to any of the songs she sent you lyrics of? Maybe you should. XP And then talk to her about them and what they mean to her. Maybe she just likes them and would like to know if you share the same interest or maybe she's trying to send you signals. You won't know unless you communicate with her.