Toddler has a rash after a fever

My daughter is 14 months. She got a fever on Sunday, because of her fever she got a febrile seizure. We went to the ER, and they educated us a bit about those kinds of seizures. They weren't concerned and sent us home. Her fever broke the next evening. But since then she's been feeling unwell...each day I wake up hoping that today will be better...it's not better yet. (She's also getting 2 teeth.) So now it's Wednesday and in the morning I noticed a rash all over her torso, and her face. That really freaked me out...because of hearing stories about meningitis. When I press on her skin with a clear glass it leaves a white mark. I don't really know what to look out for..or when I should go back to the emergency. I have a doctor's appointment tomorrow..but I'm just not sure what to do....like is it normal for my baby to break out in a rash a few days after a fever? Is this super concerning? She's still drinking her milk but she's really fussy, and doesn't want solids. I'm stressed out.

Edit: so it sounds like my baby has Roseola. I wonder how long it will take for her to be completely recovered....of course I'm still going to get my doctors opinion, but I appreciate all the comments. It's given me a bit of reassurance.