Baby girl is sick!

My daughter is 3 months old and a few days ago she developed what I thought was allergies from cut grass. It’s starting to get worse with a runny nose, extremely stuffy nose, a cough that is starting to sound horse and has a low grade fever here and there. Is there anything I can do to help her feel better? I suction her nose and have a cool mist humidifier. Should she gets seen by her dr? I know there isn’t really much to do at this age