Obviously what you said makes sense RE: Lottie. But I'm more interested to see if Mindy and Van (who were both kneeling with Lottie at the end) are A) both still alive (Van) and B) if they are both still in touch with adult Lottie.
I am not sure, now that the season is over, what the woman being kept captive's plot point was given what happens in the finale. Just to show that Mindy is indeed capable of a lot of ****...well we knew that.
Also, what we see in the very first episode of the season with the girl running in snow and 'falling'...I am not so sure that isn't something that is yet to come. If there is a cult, they may do some ritual every few years or something back in the wilderness and that 'incident' is in a future ep. Just a thought.