3 year old wetting the bed at night

My 3 year old girl is basically totally potty trained during the day. Rarely has accidents. However, at night it’s a different story.😩 I have been putting a pull up on her at night because I got so sick of washing her sheets daily. She pees quite a bit in them. Is this normal? Will she grow out of it? My 4 year old son has never wet the bed. He potty trained much easier than her in general. Just curious if anyone has any advice/experiences?