Not all dogs have the same bladder capacity; it's just a rule of thumb.
When I wake up the puppy goes immediately outside, I have slippers and a coat beside the bed and get up and pick up the puppy and outside they go literally seconds after I've opened my eyes.
Even if she's sleeping through the night she might not be able to hold it all night, is she still peeing even if she's been up once in the night?
If not then try setting your alarm for midway through the night and take her out each night for the next week or so. No fuss just quietly pick her up and take her outside then put her back in the crate and go back to bed.
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010