Well if you're typing this from your phone, I'd try to call Cristy again. First, ask her to confirm the number of dogs she has. It's possible "Kana" was never one of her dogs to begin with. If she says Kana's hers, ask her if there were any additional instructions on caring for HER specifically, bc clearly this woman knows how to live with her long term, there's gotta be something you're missing.

If not, well, it seems you might be safe to try to go in for your keys if you wait til daylight, "Kana" didn't seem to be as dangerous at least (I don't recommend this)

If all else fails, just take to the road and keep walking til you find someone to help.