Without a picture I cannot advise you at all on what to do with the coop.
As far as the water goes - you have 2 options - run an extension cord and get a heated dog dish (if you only have 3 birds this will work) or bring out water morning and evening for them to drink and swap waterers out.
As far as the water goes - you have 2 options - run an extension cord and get a heated dog dish (if you only have 3 birds this will work) or bring out water morning and evening for them to drink and swap waterers out.
And put her on the roost under the cover of darkness. That has always worked well for me.