I’m so confused

Te

I have a two year old who has been getting musty since she was one. It was mild back then but it seem to be getting stronger . I’m not sure if it’s safe to put deodorant so I haven’t. I use soap and water but her teacher has came to me about it and I smell it a lot when she’s home. It’s so strong I have to change her clothes. Has anyone had this happen before? What should I I do?