Thanks again for your thoughts everyone. We've been getting the word out on Twitter today too, as well as putting posters on the street and speaking with neighbours and the postman. Contacted my three local pets at home as they all have an adoption area, just incase someone hands her in as a stray.
Vets are on my list to contact tomorrow, I didn't actually think of that today.
We're still baffled by it. There are just me and Simon at home (with the pigs and cats!) so nobody else to close the hutch up. It has chunky toggle/latches (not the regular little metal ones) that are pretty stiff, so wouldn't fall back into place by themselves. It still doesn't make any sense!
Sadly, still no sign of my lovely girl but I'm not giving up hope of finding her well!
X x