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She bet that SPY will take a breath when it failed to break through 200. The trick she played was, instead of shorting SPY, which could be tremendous risk, she bought put. It didn't take much capital, and the potential loss is limited. Before SPY recovered, she got out to lock in the profit.
You have to admire our 2nd elder sister at some point :)
Disclaimer: I don't day trade. Please take whatever I said with a grain of salt.