Baby yeast infection won't go away!

Jane • FTM due on Feb 4,2016 with my princess <3 💖🌺🌸👨‍👩‍👧
She's had this for about 2 weeks now. I've used the nystatin cream they gave me and it's like it will not go away! Ugh I'm so worried that my DD is uncomfortable and I have no idea what to do. I've told her pediatrician and all they say is keep using the nystatin. 
Will this ever go away? Do you know any safe, natural things I could probably shower her with? Yknow like a special bath or something.