At one point she had taken them off and was on the play mats... I turned my back to respond to an email, and when I looked back she had her boots on and was sitting at my feet.
I asked my sister if she'd put the boots on S, but she said no; she thought I had. It seems someone has learned to put her own wellies on - and on the right feet too!
Fast forward to Sunday, and we're playing in the living room... then S wanders off to the hall and collects her shoes...
It looks like we're learning how to put our shoes on!