Abiut today's strange evening

So me and my girl bestfriend were going back to our houses from our classes and were walking together. The moon wasn't even visible and she says, "The moon is beautiful isn't it?" I said "bro are you blind? Where's the moon?" Then she went silent. And started to act a little strange in a way that she's hiding something. Then i got her a Icecream and she started to talk about politics that also about delhi elections (she hates politics and the discussions while i love them) which was very strange. So i asked "Tu thik hai?" "Kyu nhi ho skti?" And then i was like okay bro chill.. fir i got her a chocolate and she was normal but that part when she was silent still makes me think what would have been the reason?