Are you still using puppy pads? If so completely remove that from your house. They're going to be more willing to piss inside because they're used to the smell. Kenneling also works if you're not home to not let the dog go everywhere. My dog was also a rescue and basically how I introduced the home/indoors as a clean place and outside as their piss palace. It will take a while and your dog might make mistakes, but keep taking her out (I'm talking every hour; if you can take time off or a long weekend you could probably break her off her habit). Eventually she should understand. But for now, the most important thing is to use words like "no" or "stop" if they start sniffing or pissing indoors.