5 month old scare

My baby girl was on the 4moms swing taking a nap right in front us while we were chatting away (my mom, my grandmother & I) suddenly she starts breathing heavy it happened like 4 times so I ran to her and her lips were white and dry and I picked her up and ran with her to the room where my husband was I couldn't help but to cry bc I was so scared she's never ever done this... what could it have been? Has this happened to your baby? She was acting weird after but maybe it's bc she felt my scare. My mom and grandma thought I was exaggerating but I really wasn't no one saw what I saw cause I'm the one who ran to her