Well, if you want to flesh her out some more, you could consolidate what you've developed about her into a hidden character sheet. That might help.
The arc I had planned way down the track to do with Janius' sleaziness has kind of been disrupted by this event no matter how it turns out. Unless Kaleeth doesn't come along and I turn him into an arsehole for a bit.
If Kaleeth does join, then you'll be managing a forth character for the foreseeable future and we'll have some arcs with how her relationship fluctuates with Janius and the pack. Kaleeth will certainly have plenty of development opportunities as she sees places other than Black Marsh and comes to terms with being a werewolf.
If Kaleeth doesn't join, then sure, there'll be tears, but by the magic of narrative we could have her come into the fold later on. She might decide to change her mind and come looking for the pack. Janius is going to walk away changed, but there's certainly some drama that could occur if a sufficient amount of time passes with him thinking he'll never see her again.
I don't mind either way though. Just get in her mind and make a decision that makes sense.