X.Y.
This age shouldn't have fruits. You possible could be setting her up to be a picky eater with all the sweets you are giving her now. I always did veggies (for my 4 kids) for quite some time before I introduced sweets.
Apples are part of the BRAT diet which is to help kids that have loose bowels. Give her just breastmilk/formula for now and maybe some infant oatmeal but lay off everything else till she gets "normal".
My favorite rash ointment was called Butt Paste. If she is having hard stools, you can put some vaseline on a qtip and lubricate her.