We've had older rescue dogs that needed housebreaking, too. We approached it about the same way we did with puppies. Take her out when she first gets up, before and after meals, after naps. Make sure to take her out whenever your husky has to go--she'll learn that that's the appropriate place to be faster if she's got a good example.
And if you miss the signals and find an accident in the house, just clean up--scolding or correcting after the fact will only confuse her. If you catch her in the act, though, make a vocal correction (a low, throaty uh-uh, or "no", or something on that order), interrupt her and take her outside to finish. When she finishes up outside or has gone outside on her own and eliminates there, praise her up calmly and proudly. If she likes belly rubs, slip a hand under her belly and rub it softly as she stands there. Our rescue girls all liked that a lot before they understood about praise or toys as reward.
If you can't follow her and watch her all day, tether her to your belt to keep her with you. Tethering is useful for a number of reasons--it will help educate you
on what her signals are that mean she has to go (and in rescue dogs that aren't used to indoor living, those signals can be very subtle); it will help the two of you bond just by the fact that you're living hip-to-hip for a while; she'll get used to the sound of your voice and learn to listen for it; and it will enable you to immediately interrupt any inappropriate elimination and redirect her to the outdoors. You probably won't have to tether for long--just long enough to learn her signals. She'll get the idea--just be very patient and consistent.
So nice of you to take in this dog and give her such a good home!
Your other dog will help, too. Our older rescues learned a lot by watching and interacting with our other dogs.
Please keep us posted on how she's doing and when you get a chance, we'd love to see some pics of both your furbabies!