Here to Slay by Radhika Sanghani

Kali has a lot to deal with. Her crush doesn't notice her, her parents love her cousin more, and a big family wedding is overshadowing her 16th birthday. So, she really did NOT need a demon appearing in her bedroom and for the fate of the world to rest in her hands. 
 
It turns out that all girls named after the Indian demon-fighting goddess Kali are imbued with special powers, and are destined to fight demons. At least she's not alone in this mess - she's got the very cool, very confident K to teach her how to be a demon slayer. Now, if only she could also figure out how to slay at life...