Are 16 Gauge size earrings okay for normal piercings?

A gauge is the size of the needle or jewelry. Ear lobes are done with a 20 gauge needle. Body piercings (facial, belly button, cartilage, etc) are done with either 16 or 14 gauge hollow needles by a professional. I wouldnt recommend using a 16 gauge needle for an ear piercing, nor would I recommend you doing it, have her go to a professional (professionals dont include Claire's or Piercing Pagoda etc) But if you do plan on doing this anyways, it should be fine as long as its a hollow needle and you have 16 gauge jewelry to insert after the piercing.