It was quite Evident she was jealous or insecure of Mahira.
Sana never thought of Mahira as her friend while it was clear Mahira always supported her and treated her as friend.
Sana become captain because of Mahira and her support . Bagga could have not saved her enough . But, not once sana thanked her,
Sana used her that’s it.
From the beginning to end she always pulled Maira down.