Lea's tasting was less about food and more about the underlying hostility between Adriana and Joanna. You could have cut that tension with a Fontainebleau butter knife. Clearly Joanna isn't on the same page with Adriana and Lea about Karent's behavior, and it was palpable how uncomfortable she was. And then there was the awkward moment when Joanna confronted Adriana about being flirty with Romain. I'm guessing Lea didn't know that this uncomfortable chemistry was on the menu for her big tasting. All the more reason to just sit back and focus only on the food.
Prediction: Given how much they already seem to dislike each other, I'd say the likelihood of Adriana and Joanna becoming BFFs is slim to none.
Next week Joanna discovers that Romain's been cheating. I imagine there will need to be some serious vodka drinking to process that.