Is it a medical problem, or a training issue? How many times do you get up during the night to take her out? Setting an alarm clock is usually the best way...
Btw: Please take the time now to introduce yourself to the community in the introductions forum. Per the site rules, that is the first post all new members should make on this site, and before partcipating to the rest of the forums.
Not sure, or just haven't read them? Read the Rules before you post please.