I'm looking for a book in English. It's about werewolves (or shifters). A girl is sort of a werewolf princess (may not be a shifter/werewolf herself), and many werewolves would like to mate with her. I think she's sort of forced — possibly locked-up — to participate.
In order for her to pick a mate — her true mate — there is this ritual: In a room in a cabin, there is a line in the middle. She stands in one half, while the potential mate(s) stands in the other — the mates are not allowed to cross. I think things nearly went wrong — that she was almost attacked — and was taken to a side room for protection/to recover.
I also seem to remember a long line of potential mates, and she — breaking all tradition — going past it and rejecting many "hopeless" (definitively not her mate) candidates to speed things up. But I may be mixing it with another story (if I am, I'm interested in that story too).
At the end, she hasn't found her mate. Then, some really dirty, disheveled boy — some caretaker or something? — who really didn't come looking to get a mate, proves that he's her mate (some sort of recognition when they see each other).
I sort of remember but maybe mixed-up by another book (If I am, I'm interested in both): There is some time-limit to find her a mate, and she's been — begrudgingly — meeting possible mates at the pack-compound for months (possibly close to a year); and the line-up & cabin is sort of last-ditch attempt to find her a mate.