To leave well alone means to refrain from changing or becoming involved in something so as to avoid unintentionally causing problems, which is what she would be doing if she played the same game with lee porter as the outcome.
Context: "Playing the same sort of game with lee porter as the outcome was a far more dangerous prospect, and one she would not try to change or get involved in so as to avoid unintentionally causing problems." Claim: "Playing the same sort of game with lee porter as the outcome was a far more dangerous prospect, and one she would leave well alone."
Considering the context, is the claim true, false, or unknown?