Remedies for diaper rash?

Kelsey • TTC baby #2❤️ Baby girl born 03/26/2019🎀💗

My 7 month old has her first diaper rash and I’ve been using desetin and it hasn’t been working. I left her diaper-less for a little bit tonight but now it’s bed time so I obviously had to put a diaper on her. Is there something I’m not trying?