belly bands are for little boys, training or heat panties
http://www.designerdoggie.net/ are for the little gals you can find them on most dog apparel websites. This is only bandaiding the problem but will help in a pinch...
You have to be very diligent about training. If you are giving her full run of the house, too much freedom is a bad thing when training. You must take her out first thing in the morning, after feedings, after play time, after naps, just before bedtime. Doing this religiously with patience and praise she should get the hang of it.
I wouldnt limit food and water at this young of age, but you can stop water after 5pm nightly to help, providing your dont have active play or exercise or very hot weather. If you do give her water, take her out shortly after.
good luck