Try to put cold wash rags on the eye several times today to reduce the swelling. She could have a slight allergy to something, my son had puffy eyes when he was a few months old too and there was no reason they could figure out. When it got red and crusty one time, they prescribed drops but if it's not red at all, I wouldn't worry. If it gets worse take her obviously to urgent care but wouldn't go right nowand put her through that. Give it some time to calm down for a couple days. Just check the lid and see if there's a bug bite, it's the season for all that. Good luck today.
If you still want to talk to someone, call the maternity ward at the hospital and ask for a nurse. I called there so often when I couldn't get my doctor because of after hours. Explain it's the holiday, could they advise you, I'm sure they will.