Someone made a small, apparently fraudulent, transaction to my public address. What is the purpose behind it?
She might be expecting you to make a transaction consolidation all of those coins you received. Since the inputs of a transaction are almost always the coins (in jargon "unspent outputs") of the same person, she could then find the transaction which spent those 0.2 cents, add up all the inputs, which would be the amount you earned in the last N days.