She was and she was sitting at Leo's table.
But who knows? They might be just friends? Not sure, and we still don't know about the current situation of Leo and Camila.
Still I have to say I noticed Gigi's presence at the same events as Leo at least 3 times since he went to NY. So in the first time he was spotted in NY in this recent trip he was having dinner with Timothee, Gigi and a group of people. Than she was at the opening of Nomad restaurant, and Leo was there too and now the third time at this Moonlight gala. Even though IF they were about to have something it would be a bit odd because Bella is kinda friends with Camila.