Giana got a call from Chad, one of Leon's confidants, to go with Leon's men somewhere.
Therefore, Giana's plan to return home with Dillon after the power return did not happen and Dillon left alone, while Giana went with Leon's men to the place Chad told her.
At first Giana did not suspect anything, she was just curious about what Leon would tell her.
Because they haven't been communicating well for the past few months and Leon only contacted her again after the divorce issue between her and Aidan surfaced in the media, especially when Giana took over the Dawson family company.
Apart from Dillon, Giana also needed other advice from someone she could trust and that person is of course Leon.
However, Giana had absolutely no idea what Leon was going to tell her tonight. Didn't they meet at the party? Then why did Leon actually ask her to go to one of his houses just to talk to him?