She's 7 months old so I assume you have bought dry food for puppies. On your food package there should be a feeding guide, including information such as ME/kg, ME/cup or g/cup, as well as how much to feed a puppy aged e.g. 6-12 month weighing 20-25kg. I would follow the guide. They tend to be on the high side of energy for adult huskies, but since your pup is too thin, you probably don't have to worry about it.
I checked my favourite brand and the calculation comes up to feeding a pup like yours close to 2000kcal a day. After she hits 12 months of age though they suggest only about half of it. So if they've been feeding your pup based on the adult calculations, that could explain why she's a bit thin.
Wow! You have 5 other dogs! 😮