You are exactly right that there was a sighting of Mekayla according to the Tosguna Tsuut'ina Nation Police Service Facebook Page. It states that 'It is believed that Mekayla was in attendance at an event on January 20, 2017 at the Grey Eagle Entertainment Centre' (Grey Eagle Resort and Casino) in Calgary. That tip is currently being investigated. The posting date according to their Facebook post is February 15, 2017, fairly recent. Something interesting to note is that the Tosguna Tsuut'ina Nation Police Service themselves said that in this particular case, she (Mekayla) was last seen 'on' the Tsuut'ina Nation (reserve). Their original post did not originally indicate that she was last seen in or around the residential area of the reserve itself, 'only' at the Grey Eagle Resort and Casino. That said, they seem to be fairly adamant that she's in the immediate vicinity of Tsuut'ina Nation itself and not solely at the Grey Eagle. Hopefully, if all goes well through this investigation, Mekayla will be found.
Tosguna Tsuut'ina Nation Police Service