
Not sure this is going to be helpful, but I had exactly this problem with my young girl for a long while, the only time I've ever had a problem house training a Collie. I bred her too, so can't blame anyone but myself ;) - I walked her last thing at night, took her out first thing in the morning, got up early to try and break habit .................. she was fine in crate, so could obviously hold it - can only think that maybe foxes/hedgehogs disturbed her, she moved, and 'the urge' took over.
Apart from crating her at night, didn't find any particular answers I'm afraid, but she did grow out of it eventually, by about 8 months I think, and is now totally trustworthy - apart from with one bed (mattress type with quite stiff cover, don't know if that has any relevance?), which I have now given up using as without fail she will pee on it the first day it comes in, no matter how thoroughly it's been washed

M.