Covid in Kid. Health issues? misc?

On 24Jan night, my 5 year old got sore throat. On 26 Jan local pediatric said it normal viral & prescribed Solvin Cold Syrup 7.5ml 3 times 3 days &Azithromycin 5ml 5 days. On 26Jan I gt fever 100 so got tested for COVID and got +. My family doctor gave regular medicine and asked not to quarantine as my kid also had same. We also asked pediatric and he said the kid must be COVID+ but no need of test and same continue medication. On 29 Jan my husband also +. But my kid had no other symptoms and only sore throat. On 30 Jan my & my kid course of medicine was over. We were completely fine. On 31st Jan my kid has rava idli sambhar for lunch, then strawberry. She complained stomach ache and pain in legs in evening. I gave her cyclopham 5ml. Late night she vomitted badly. I gave her Vomikind 5ml a After an hour she got 100.4 fever so gave calpol 250 5ml. On 1st 11 AM she 102.35 fever and severe stomach ache. She test + COVID, NRL ratio 6.5. wht reason for sudden health issues? MISC?