Lepto is a hard call.
Maybe try calling the nearest vet school to you (I think it would be Cornell) and see how often they give it or if they recommend it (make sure they know it is a dog under 10 pounds). I would take Cornell's word over a local vet.
Lepto shouldn't be given before 16 weeks because it can suppress the immune system.
For every argument that the vet and tech gave you, ther are counter arguments because it is not a great vaccine in my opinion.
Lepto is dangerous BUT the vaccine doesn't protect against every strain.
Most dogs do just fine with it BUT Yorkie puppies have died from the vaccine.
Throwing up could've been car sickness but there is no way to be sure and if she was throwing up from the lepto, the reaction could be worse this time.
If you are going to give it she needs to be pre-medicated.
Reactions are more likely to occur the second or third time the vaccine is given.
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