Good morning,
It might sound strange but infections are going to come even if you do everything under the sun, as long as humans are around. So don't worry about the infection part. Parts to be worried about
1. Nutrition
2. Whether she is getting admitted for infections and she needs antibiotics
3. If she is active during the infection, nothing to worry.
Next Steps
1. you should be worried if she is getting admitted for recurrent infection and needs prolonged use of antibiotics other than nothing to worry
2. You baby whether she is gaining weight properly or is she lagging behind you should check
Health Tips
1. Ask her to wash her hands when she goes out and comes back into the house
2. if she is going to school, make sure it is well ventilated
3. give good nutritious food, if you are a non vegetarian, give egg or panner if vegetarian
4. some studies shows that taking
vitamin c helps so you can give citrus fruits, gauva and amla