Regarding guaze pad tat struck at healin

Hi doctor, my daughter is 3 yrs n 4 months old...her knee skin scraped at road when she fell at her knee...it's been one n half days...i washed with clean water n baby wash then applied petroleum jelly n used guaze dressing with air circulation in order to avoid her hand touching her wound...but today I noticed tat it got struck n i pulled forcefully n removed it...she already complaint of paining sterday n NW she is in more pain n not even allowing to touch...guaze thread also some sticking at wound n she not allowing to take it properly...mostly i took somehow till NW...also immediately applied supirocin ointment since I removed it forcefully to avoid infection...hw many to continue it n hw many times...hw to remove minute guaze threads from wound...will washing wound remove it...is antibiotic ointment necessary or i used it unnecessarily...is it safe to use to prevent infection