At 4 months old her self control is going to be short-short-short. Your task is to be more interesting than the other dog, which is no easy task. I would suggest teaching her when the other dog is not around. It will be much easier for you and your dogs.
At my house, if I reward one dog the other dog wants his/her piece of the action, too. If I need to work with them together I use a "down" command. I would recommend some sort of place marker like a dog bed or bath mat. One dog has to be down on the mat while the other works and then swap. You can do that after your pup gets a bit more mature. Now that my dogs are 3 and 5 years old I can tell them Big-boy's turn and Gal-dog's turn but even then I keep turns short before swapping them out.
Patton CGC BH
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