Sadie got bombarded with shots! No wonder she was lethargic.
Toy breed dogs can get very bad, even life threatening reactions to both Lepto (the "L" in her shot) and corona. For that reason we don't like to give them unless there is a lepto outbreak in your area. In that case, they should be given separately from the rest of the vaccinations several weeks later, never in a combo shot like Sadie got. (Fort Dodge makes a single lepto vaccine).
Rabies should always be given separately from the rest of the vaccines due to possible reaction.
It doesn't sound like your vet is very knowledgable about toy breeds. You will have to insist on a safer schedule next time. You were very lucky.
Here is Dr. Dodd's recommended vaccine schedule which has been adopted by 27 vet schools.
W Jean Dodds Vaccine Protocol VACCINATION PROTOCOLS