My 8mo daughter had a fever and malaise/fussiness on Monday. Two others of us were sick and/or recovering, including me, her foodsource.

Yesterday, she was great. Today, her fever is back again, and she is miserable. She is having difficulty sleeping, which is unusual. I don't think it's just teething, although it might be part of the problem. She is having trouble nursing because of her drainage and stuffy nose. Any suggestions?
Also, on my worst day, I was using these EO: oregano, lemongrass, and lavendar. I was doing a massage on my upper body (but not on breasts), pretty frequently throughout the day. Do you think this has caused her any problems?
Thanks for any help!