I usually wait at least a week before offering food, especially for a newborn. How old is it? The size may be okay if it doesn't look emaciated. For now, I would just make sure it's hydrated and leave it be with proper temps for a week, then offer food. After that, you'll know if it is eating or if you're going to need to do something to help it.
What do you mean "she seems very weak," is she not active at all?
Also, I'd keep all your conversations with the person you bought it from. And ask for any feeding, birth, and weight records from the seller.
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