Your vet didn't find out what the problem is? What, if any, tests did he do?
A dog as small as that needs to eat regularly, and can get dehydrated easily.
Sitting in a bag and sleeping all the time is not normal for a terrier pup.
I would take her to another vet if she is not back to normal by tomorrow.
Do NOT give a tiny dog (or any pet) any human medications if you don't know what is wrong with her.
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