my daughter started swimming last year and she caught nail fungus at the public pool.

my daughter started swimming last year and she caught nail fungus at the public pool. It started with a white line and now it looks like this. I’m petrified since she’s only 7. I’m worried of it getting much worse. Unfortunatel, she also has to wear a foot brace (AFO) so that doesn’t help because she gets really sweaty. im worried of giving her oral medication. any suggestions for a child?! i Would greatly appreciate it!!!