You don't need to. Just make sure the material the earrings are made with suits her (you'd know this in a day or two, if there is no rash then she is fine). On the other hand, at that young age you might end up closing the piercing if you forget to put them back for a day or two. (It happened to me at age 3 when my mom didn't put mine for 2-3 days, getting them pierced again was no fun). The skin can very easily grow back, best leave them in and clean once in a while (that's what my mom did and all mom's I know do).
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