Both of her parents have stated she would go places for a few days at a time. Where are these places? How does she get there? Without a car or public transit in town, I'm assuming someone else goes with her? It just jumps out to me that if it wasn't initially alarming to not hear from her because she does go places for a few days at a time that maybe this started out that way but something happened while at this "place." I'm sure LE is looking into that possibility.
Another question I have since she didn't have a car: did she ever hitch rides with strangers? I know this is not super common on the whole nowadays, but in small towns, it does sometimes still happen. I have driven by people hitching rides on my way to work in a small, rural area where I live. When visiting national parks out west in states like Wyoming, Montana, Utah, etc., I have witnessed people hitching rides (in general, it's more common in the outdoors/backpacking community. I'm not saying she was part of that community, but Montana is a pretty outdoorsy place and it may be more common there).
Another question I have since she didn't have a car: did she ever hitch rides with strangers? I know this is not super common on the whole nowadays, but in small towns, it does sometimes still happen. I have driven by people hitching rides on my way to work in a small, rural area where I live. When visiting national parks out west in states like Wyoming, Montana, Utah, etc., I have witnessed people hitching rides (in general, it's more common in the outdoors/backpacking community. I'm not saying she was part of that community, but Montana is a pretty outdoorsy place and it may be more common there).