Biting help

My 15 month old has been biting for a few months now and I’ve tried everything I can think of besides popping her in the mouth when she does it. I currently have 6 quarter sized bite mark’s from just today and ten others all at different stages of healing. I’m a stay at home mom so she didn’t learn it from another kid and I’m the only one she will bite. My 3 year old never went through the biting stage unless you count the biting she did while I breast fed her till she was 6 months( wish I could have done it longer but my nipples just couldn’t handle the biting anymore once she got teeth) any ideas would be awesome