Update: we now have a paramedic, an ambulance, and an Incident Response Unit. And I can now see someone getting kitted up with climbing gear of all things.
Update 2: the local news reports that there's someone on the roof of Tesco's. That explains the climbing gear and the fire engine ladder platform.
I hope they manage to get her down safe and sound.
Update 3: she came down unharmed, thankfully.