Ostara & Omens by Poppy Flynn

Seren Starlight isn’t your average witch. At 26 she’s yet to graduate from the esteemed senior academy of witchcraft because she refuses to obey the rules.
A magnet for misadventure, things always go wrong around her. She doesn’t realise the consequences of talking back to the principal sorcerer until she receives a rather stinging lesson.’
Destiny takes Seren on a series of Yuletide exploits during the Winter Solstice and she stumbles through them thanks to a string of happy accidents.
Seren by name. Dippy in nature. Serendipity through fate.