Hi Skye,bummer your girl has to go through this
I had ear problems a a child, infections constantly, ruptured ear drums, grommets(we lost count at 18 odd grommet ops)
I did grow out of it, eventually, but not until I was 11 or so and funnily enough, it was right around the time that mum gave up being a complete nazi about me getting them wet. (prior to this it had been earplugs and swimming caps all my life when school swimming lessons were on)
I think I then spent a summer at dads swimming in the ocean and I believe that the salt water dried them right out and got rid of all the nasty bacteria.
Sorry for the rambling, and its prob not what you want to hear, but she prob will grow out of it, it may just take a little longer.
HTH