When you say you come home at 10 or 11 - how long has the dog been alone in the house at this point?
Is your dog shy or submissive? If so, your unscheduled absences may be stressing her and causing anxiety, so she pees to spread her scent around and comfort herself.
If she is submissive etc, and you scold her when you come home that will make this problem worse. If this happens often, your dog will have "dread anticipation" and the vicious cycle will continue.
I suggest crating her or confining her with a baby gate in a small room (laundry etc) when you go out at night. This way, there is no anxiety and scolding when you come home. Then you can take her out right away and instead of scolding, you can praise her for being successful.
Of course, if she is NOT shy, etc. then just ignore what I said, except for the confining part.
