My daughter keeps getting sick

So my 2 year old started daycare in September. Before then she was always home with family. Since September she has been sick 4 times, she just developed her fourth cold in that short period of time.

Is this normal? I feel like I’m going crazy, every time she’s finally better it only lasts a week and then she’s sick again. Each time has been cold symptoms too. Cough and runny nose.