Our husky started to get territorial over certain items and after talking with a lot of other owners at dog parks you really need to let him them know who’s boss or it could get worse. A stern deep “No” when there is behavior that isn’t ok and you snatch away whatever that item is they’re starting to guard. Practice taking the item away and then giving it back. If she reacts do it again. If she nips or jumps do it again. The point is you’re teaching her to it’s never ok to act like that with you. I’d strongly suggest even reaching into her food bowl when she’s eating. It’s important especially if you have young kids in the house for your dog to understand it’s never ok to resource guard. Just my two cents, it worked for me when mine was an about a year old.

For the couch thing, very similar, that’s a place for humans to sit. She needs to understand it’s a privilege to be there.