KU fantasy romance book with a spy and redhead

I need help! I’ve been looking for weeks now. I read a book maybe a year ago on KU.

THE FMC was adopted by a botanist (i think botanist) and would go to the woods to collect plants. She was a red head and beat friends with the kings son but he and his friend betrayed her in the beginning of the book. She beginnings a romance with a mysterious guard/spy.

The FMC also has magic from the sun/light. She has a “brother” named Malachi. (I think his name is Malachi). In the second book he finds her and gives her an ultimatum and abducts her.

The FMC and MCC go out at night to a tavern in the woods secretly and meet his friends there.

The FMC and MCC are enemies and lovers i think also.

I hope this isn’t too vague. Thank you!!!!