Congested almost 12 week old

FTM here just wondering if anyone has any tips. My girl started daycare last week and developed a cough and some mean congestion. By the end of her first week at daycare she was back up to eating as much as she was with me at home. She’s formula fed. We got her checked out Sunday no fever said she was good did a deep suction on her and just to keep an eye on things. Now it’s Tuesday still no fever boogies & congestion are still present but she’s only eating 2-3oz per feeding when before they were 4-6 and sleeping a lot!! She’s also entering a leap today. Don’t know if I’m over thinking things or if this is normal for her having a cold. Thanks so much.