I just realized that scene is so funny when we go with Kara crushing on Lena from the first moment she sees her and Lena actually already knowing that Kara is Supergirl!! I’m rewatching their scenes for the 100th time
So Kara is acting a little nervous when she walks with Lena and Clark into the office, it’s noticable when Lena has her back turned to them for the first time..
Then Lena says that Superman saved the day and Kara’s first reaction is to add that Supergirl was there too.
So Kara has a crush on Lena and wants to make sure she knows that Supergirl is as much of a hero as Superman trying to impress the girl
And Lena already knowing about Kara being Supergirl would explain this reaction so much other than Lena being totally gay for Kara
Her first reaction is surprise, then that smirk and then she’s already turning her back to them again so they don’t see her reaction which is her totally laughing about Supergirl telling her how Supergirl saved the day because SHE ALREADY KNOWS and Lena probably thinks Kara is being really cute while introducing herself
and later where Lena tells them that she tries to make a name outside of her family, she asks if they understand that and then she looks to Kara who agrees with her right away which just makes me think about HOW MUCH THEY HAVE IN COMMON AND HOW THEY JUST GET EACH OTHER