Bad diaper rash! Help

My daughter must have had something that messed with her stomach because she had diarrhea in the middle of the night. She didn’t wake up and cry and I didn’t know till we woke up in the morning and she started crying when I said let’s change your diaper. I’ve had a cold so I can’t smell.

When I changed it I felt awful because I feel like I failed her. It looks so painful.

I got Boudreaux’s buttpaste but is there anything I can do to speed up the healing?