What you need to do is get a pen. Like a kids play pen. The dog will not "go" in the pen. Leave her in there for 1-2 hours at a time (put water, food and toys inside with her), then take her outside. After she does her business, bring her back inside for a very supervised play. If you can't play then, just put her back in the pen. If she cries when left alone, you can put her on a leash and connect the leash to somewhere where you'll be. She won't "go" in that area. After a while, she'll realize where she's supposed to do her business. She will learn! I have a maltese-poodle-mix who was having trouble, but this really helped. Good luck!
Lark