The polite thing to do might be to recognize Fenris distancing himself from the others at camp is due to his own problems, and give him the distance that he wants. But Kaisa has never been accused of politeness, and she doesn't see any reason to start now. So one camp, when he looks particularly glum and by himself and like what he definitely needs is someone to bother him, she strolls over, dog at her heels, and plops near him. The dog plops on her, proving that large dogs can be lapdogs if they try hard and believe in themselves.

"I like your sword. It's pretty big." She starts off, grinning shamelessly. "But I think mine is bigger. Want to compare?" That's not an innuendo, you're an innuendo. Her sword, for the record, seems to consist of nothing but a gaudy, colorful hilt. But there's probably a reason she's carrying a sword hilt around, right?