Pat where is she having accidents? In the house or in the crate if she is crated? Is she clean in the crate if she is crated? When are the accidents happening? Does she give you any warning signs before squatting or does it seem to take her (and you of course) by surprise? Are you home or do you work during the day? How many hours do you usually wait between potty trips? Could she have a UTI or some other physical concern that might be causing incontinence if she is messy in her crate as well?
I would take it back to basics as much as possible. She'll learn best if she is set up to succeed, so if you can - during the times when she is out of her crate, tether her to you with a 6 foot leash clipped to your belt and/or keep her enclosed in whatever room you are currently in. That way she's always within sight and sound of you and you will be able to spot any warnings she gives before squatting. Don't scold her for any accidents she has that you don't see, but do tell her no if you manage to catch her, and scoop her up and bring her outside to finish. If she does finish outside, even if it is only a drop, praise her til you're blue in the face!
Having a solid schedule will also help her - do you feed and walk at around the same times daily? With Nanook, who took about a month to train, I actually kept a log of when he ate and when he napped and when he was let out to potty - it helped me keep track of how often he was going so I knew what to expect from him and it seriously cut down on accidents since I was able to look at the chart and say "it's been three hours since the last time you went out! To the lawn!!!" Always try to go out the same door, and to the same area of the lawn to potty. She should get the idea and start trotting to that door whenever she wants to go out. It is important when she DOES trot to that door, that you open it immediately with praise and take her out. That will help her put two and two together. But that means you really have to keep an eye on her until she's trained so that she can be rewarded with an open door when she does what she should. It might also be that she has a smaller bladder than the other dogs you've had in the past - maybe she can't go as long as some of them did when they were puppies. It's amazing how different they can all be!
Try to encourage a behavior that lets you know she needs to go apart from the puppy "circle and sniff" - teach her to bark at the door, or to paw or nose a set of hanging bells on the doorknob so that you can hear she needs to go out even if you are in another room. To teach the bells we hung them on the door we always went out of to potty and cheerfully smacked them whenever we opened the door. We made it seem like a fabulous game and tried to encourage Nanook to hit them too. He's nose-expressive so he was soon nudging them all over the place with his face. Any time he nudged them, even if it seemed like it was by accident, we opened the door immediately with lots of praise and then took him out to potty. We made it obvious that bell-ringing meant potty time, not play time, by taking him out on lead and then not moving from his potty area until he'd gone. THEN he got to romp around a bit with us and play as a reward for pottying, and then back inside for a small cookie. Even so you might get what we've got - a puppy that rings the bells whenever he's bored and wants to go outside to play! Sometimes they're too clever for us...
Pooka is almost 13 weeks old now, and he's been ringing the bells for about three weeks or so consistently. He learned almost immediately, (he actually rang the bells for the first time his first night home with us), but his performance was inconsistent to start. He's been much easier to train than Nanook was, (he's only had two accidents indoors since he came home - compared to Nanook's 18!!!) but I think Nanook has been helping us to teach him too.
