Don’t know what to do

Aubrees been fighting a cold/cough n so haven’t I. We are trying to stay away from addy. Germ wise. But it seems little addy is getting it again. She can’t win. Since her hospital stay last month. She’s was fighting that cold. Than caught a sinus infection. N now another sinus infection. 😩😩 how can I keep the germs away better? I know the weather changing is getting to us. But I’m CONSTANTLY cleaning to try to keep the germs away. But no matter how much I clean or disinfect everything she is still getting sick every time the weather spikes up n back down to cold. 😖😖 I’m just curious to if her have reactive airway disease if that’s why she gets sick so easy is all. She also has really bad allergies. She’s on 2-sometimes 3 different meds.