Sick Toddler

My 2 year old climbed in bed with me this morning at about 2:30, she was hot to the touch but didn’t think anything of it. She started screaming out at 3:30 saying her leg was hurting and screaming at the top of her lungs. I took her temp it was 100.9, she keeps calling out saying her leg is hurting. Not sure what to do.. I also have a new born and I don’t want him to catch whatever she has.