I get a feeling her problem is along the lines of:
1) You paid money (or paid with eyes/ears on an advertisement) to listen to her song
2) She doesn't know you did so...
She's not getting "Money for you listening".. or at least, she has no way to know it.. Pandora doesn't tell her how many times her music was listened to... Being in a business.. it IS helpful to know exactly how many transactions you made to get your $500... or .. how many of what song was sold..
I agree with you.. She doesn't need my name, or birthday, or my financial information.... But if she wants to know I listened to Her Songs X, Y, and Z... and that I bought Her Song A.. She should, in my opinion, be able to get some kind of breakdown of that information (Here is $250, your songs were listened to by 20,000 people.. 240 bought the following songs:)
This data requires no data mining.. It's data Pandora already has and uses to pay her royalty... and the only cost is from writing the artist a semi-detailed receipt to go with her royalty check.. currently Pandora says "Here's $300, no.. you can't know how many times each song was listened to.. no.. you can't know how many songs people bought"
Great for us.. Great for Pandora... makes learning what we (the audience) like to listen to and buy impossible without getting the tainted groups of fanatics who seek the artist out on their own..