I have an Alaskan husky from working lines in the city, so I can empathize. A fenced yard helps, another dog to play with in the fenced yard helps even more (I have multiple dogs myself but a friend or neighbor works, too).
Physical exercise - walks, obviously. At her age you don't want to start out here, but shoot for working towards 45-60 minutes of walking a day if possible as she matures. For some dogs, two shorter walks work better than one longer walk. If her personality is suited to it (not all dogs' are) and there is one available to you, consider a dog park but be careful, a lot of kind of dumb people go to dog parks who let their dogs behave inappropriately. My recommendation is to stick to off peak hours (weekday mid-mornings are the quietest around here). If you don't have a dog park in your area or if it's not an environment you want to be in, try setting up smaller play dates with friends' or neighbors' dogs in a safe fenced area.
Also for a dog who is and will be so smart, a lot of mental exercise is a must. Consider things like trick training or agility if classes are available in your area as well as traditional obedience. Read about a style of training called "shaping" - a lot of dogs LOVE this style of learning where they offer behaviors and do the mental gymnastics to figure out what you want instead of being formally taught. Consider fun things like Rally obedience, or, if it's your thing, competitive obedience. You would be amazed at the types of things that a lot of training clubs offer these days. Just browsing around this site, particularly the sports subforum, you'll find a lot of ideas of things you can do with your dog.
Also, if it is possible to participate in activities your dog was "meant" to do, it can be a real life-saver in my experience. For me, that's urban mushing. For you, that might mean some herding classes but I don't know how available or how affordable they will be for you. You could always bike or bikejor with her even if she doesn't want to pull, the running is good exercise for any dog, not just northern breeds.