My wife is worried about my 3-year-old daughter who is not potty-trained yet. She is supposed to start school next month. What should we do?

Have you heard of the three-day potty training for kids? I kinda used that for my 2-year-old son. However, before I did this intensive three-day regimen, I did a week or two of preparations for him. PREPARATIONS BEFORE THE THREE-DAY TRAINING: 1. Talked to him that whenever he peed or pooped, he should use the toilet (I did not use any special potty trainer seat except for the small seater placed on top of our toilet bowl). 2. Me, his kuya, and his dad modeled for him. We made sure he saw us use the toilet. TRAINING PROPER: 1. This needs three full days of commitment on your part as a mom or dad. You have to put your all into it since this will be very physically draining, and dirty even. 2. Day 1 - Free your child of diaper and let her wear loose fitting shorts or comfy dress without underwear. Then let her do her daily routine. Just make sure you are watching her all the time and asking her every once in awhile if she wants to pee or poop. Make her drink lots of liquids to encourage peeing. Day 2 - Do the same as day 1 plus an hour of outdoor walk. Before going out, make sure to let her pee first. Day 3 - Do the same as days 1 and 2 plus more time outdoors. NOTE: Whenever she poops or pees in her pants or on the floor, try to make her know that it's not ok without scolding. Whenever she uses the toilet successfully, praise her. For some additional reading, please read this: http://www.babycenter.com/0_potty-training-in-three-days-or-less_10310078.bc