She took the pic so when she ran tattling to the elders, she could prove it to them. See, looky! Do you see that, there sits atacrossroads, dining with Cousin Disfellowshipped, nyuk nyuk.
I'd be so ticked off! Nobody has a right to take anyone else's photo without permission. Worse still is her motive, presumably to offer proof to the elders which could shore up a case against you. Sick!