Why wont my husky eat?

i dont understand why my husky just wont eat sometimes she will pick a little here and there but she has lost and gained her weight several times i have tried changer her food and that worked for a little while but now we are back to hardly eating i tried mixing her food with a mix you can add water to to make gravy or just add the powder to her food and that worked for a while and again she just dont eat like she should. i have to mix her food with some people food but when i do this she for the most part just eats around the dog food for the people food i also tried mixing the sauce left over from a can of raveolies a few time and she likes that but i cant do that every time. i have taken her tothe vets for tests for worms and other blood work but everything comes back ok and my vet doesnt seem to be concerned what should i do?