pretty soon im goin to CA for like a week and i have a gerbil who really likes to be held but does she really need to be held every single day?

Well since she is alone and doesn't have any other gerbils to keep her company I would say at least every other day but not less than that. Because she could be use to you holding her a lot and then your not there and she could get depressed.

has gerbils

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she doesn't HAVE to be held every single day but it's good if you hold her most days. All it does really is make them like you more and they become tame.

no, it's nice to have some distance, just make sure she has food and water to last her.
distance makes the heart grow fonder!