Found a baby. Identification confirmation and care?

[RissaVS]

Hi, everyone! I'm new to this forum, because I'm new to garter snakes. We found what I think is a female baby black-necked garter snake in Golden, CO. My daughter wants to keep her as a pet, both parents have given the okay, but we really know next to nothing about taking care of her. So here are my questions:

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How long until we should worry about her not eating or drinking? It's been about 2 hours since we picked her up.

Did we get the identification right?

Any tips for a happy garter snake?

Thanks!