I'm flattered, but I don't have any additional input other than some general stuff to keep in mind.
1. Growing pups have massive calorie requirements, especially active ones like huskies. It might help to pull up a quick calorie calculator estimate based on weight and ballpark if your food is obtaining that amount. Volume doesn't necessarily equal calories. She's stayed happy and bright eyed, which is a good sign!
2. 1 year of age is young enough to qualify for quite a few genetic/developmental/malabsorption things, including stuff that is rare or that gp's don't often encounter and may not be on their radar, which may involve going up the veterinary ladder to specialists.
There is a pretty low incidence of many genetic conditions, however, so just keep this in your back pocket just in case and don't miss the forest for the actively growing puppy trees.
3. Track the long term trends. Fluctuating in weight a pound here or there can be based on a lot of environmental things going on, especially as she heads into her first heat. Huskies are a lean breed. That said, if it has been consistent and gone below loosing 10% of her body weight and hasn't gone back up still a cause for concern.
Going to multiple vets to get second and third opinions is excellent advice--as you do that, make sure to maintain moving the medical history over so that each new doc can bring themselves up to speed on the case.
Do you know how to assess body condition score in dogs? Where does she lie on that?
Feel free to DM me if you need.
