She is too kind to yell at you or snatch your phone. That would be rude. So, she uses ngambek as a soft boundary. By turning away, crossing her arms, or going silent, she is saying: "I don't like this, but I won't fight you."
Opsi cabang reaksi Nia (pilih gaya yang diinginkan): cewek hyper baik hati awalnya ngambek karna direkam
“Aku sudah baik sama semua orang, masa direkam diam-diam sih?”—itulah kira-kira isi pikirannya. She is too kind to yell at you or snatch your phone