Is this a sudden change or has she always been this way?

Some dogs are just mellow and low energy. I had a dog that was not food or toy driven... but he was people driven. Loved cuddling and playing with us, but otherwise... his butt was parked on the couch almost every other hour out of the day. When we brought our second dog home, he did seem to perk up a bit and LOOOOVED playing and chasing around the yard with her.

If there is nothing medically wrong to explain the mellow behavior... then just appreciate the fact that your husky mix is not a bouncing ball of insatiable energy... unless, of course, that isn't what you're looking for in a dog... maybe look into getting a second dog, or just enjoy her for the couch potato she is

Every dog is different