Dog EXTREMELY jealous of new puppy?

it was really not a good idea to bring in a new puppy so soon after your dog died. it did not replace her loneliness, it made her insecurities worse. you did not give her time to mourn and move on. she needed that time. though your intentions were good i would suggest you try and do what you're doing now and be patient. or get help from a trainer. or even do something drastic like giving your puppy to a friend for a while until your dog comes back to earth. then maybe try reintroducing them again.