One minute I think death by misadventure and the next foul play.
If RD had no reason to lie- presume that for a minute. Just basic logic for my head right now.
We know Gaia was very distressed and anxious. We know she had medical conditions. She ups and leaves and starts running and gets to RD's which is familiar to her. She is let in and starts stripping (not hypothermia in MOO- anxiety, pre- seizure, reaction to medication- combo of all). She is told to get dressed again. She says she is leaving to go see a friend and the friend lives on Cow's Lane.
So she leaves. And if past behaviour is a good indication of future behaviour. She runs. I google mapped it and Cow's lane is in the direction of where she ended up. Say she doesn't stop at friend's house as they confirm they never saw her. She keeps going and gets to that field. Area is known to her. There is even a picture of her in a field with a stone wall and the sea in the background. Could be a place she likes to go. Gets there and slows down and the state of mind is still the same so starts to discard clothing with no regard about that (hence jacket left in RD).
THEN and only then do I believe hypothermia kicks in. Stopped running so stopped producing heat. Sweating as it is quite a journey and uphill. Cold night. Hypothermia can quickly set in. Dark, muddy, cold, no phone, poor mental state not good.
Unfortunate death by misadventure as nobody there to mind her...
And then I see Justice for Gaia hashtags and know the police know way more than we do and I swing back to why she was not found previously and the clothing and everything. PM will tell us more...