My yorkie poodle dog has been attacked by a bigger dog
She is scared and is shaking
I am scared
Can she die?
How can I help her?

Tell us more about the attack. Was she hurt? Was this on a walk?

A dog fight deserves a trip to the vet.
Are there visible injuries?
Was he shaken?
Bite wounds can be deceiving what may look like a small puncture on the surface can have much underlying damage.
If he was picked up and shaken there could be internal injuries.
Best to get him to the vet for a good once over.