Landed previous flight, forgot to retract flaps, rushed turn around, took off with Full Flap selected and rotated like a helicopter much earlier than expected and surprised the crew. Have had this done in training and if you are not expecting it is a BIG surprise.
Do they have a "non take-off configuration" warning indication on the DHC6? Full flap setting before take-off would have triggered it, if it did.
It's more likely a go-around that went horribly wrong, due to the gusty conditions. To drift that far off the runway for a normal landing attempt would be highly unlikely, and if the winds are reported correctly, they would have drifted to the left, not right of runway centreline.