[FirstYorkie]

Several thoughts for you:

First, it isn't unusual at all for potty-training to take longer. Try to be patient. Although a few pups "get it" when they are younger than 5 months, most don't.

Be sure that you are adequately rewarding appropriate pottying outside. You want to really make it worth her while to go outside - immediately give extra yummy treats (which you have brought outside with you) and loads and loads of excited praise in your best little girl voice ("you are the best puppy ever. you are so smart. I'm so lucky to have you", etc).

I'd confine her to areas without carpet until she is more reliable. I moved my computer into the kitchen when Joey was a baby so that we could both stay contained on the tile. ;-)

For me, having my dogs ring a bell when they want/need to go out has worked extremely well. If I were you, I would simply suspend the bell from the door knob of the door that you take your puppy through to go outside. That way, she will begin associating the sound of the bell ringing with the door opening. You'll have to be on your toes. (This is another good reason to keep yourself contained with the pup). If puppy accidentally rings the bell, RUN to open it. She'll eventually learn "Hey, this works like magic. I ring this bell and Mom comes running to let me out! Cool."

Good luck!