We got Bailey trained in two months - the best suggestion I have it that you keep her confined in one room and watch, watch, watch her. The trick is to catch her in the act and correct her mistake. I also laid down blankets to save the carpet - then washed the blanket after a mistake (to remove the odor). We too, bell trained. When she started peeing in the house, we'd scoop her up, take her paw, tap the service bell and say "outside".
It works - but it's not easy. I'm not kidding two solid months of watching the dog and nothing else. If I had to take my eyes off her - she went in the crate. It was worth it. Two months in exchange for a lifetime of a trust.
Now she hates the crate - so we don't use them. But we do use an exercise pen when we're at work - and she's just fine in it. She gets a treat everytime she goes in it. We're gone for 8 hours a day - 4 days a week. I never tried to potty train her in the pen - I just cleaned it up everyday. I keep a litter box with a pee pad in it. Sometimes she'd go on the pee pad, sometimes she'd miss it - and often she'd chew it up. When she was about 8 months old - she started holding it all day and quit chewing up the pads. Now, once in a while she uses the pee pad - but very rarely. They learn to keep their space clean - it comes natural.
Good luck - and please, please give her at least two monts of your undivided attention. It is sooooo worth it.
