IBS and blood with stool. In one day!

My mother started having stomach problem ( IBS and blood with stool) and then got covid positive ... after recovering from covid , we approached a gastroenterologist who advised rifagut 400 mg along with other medicines ( pegred powder, nexpro and bifilac hp) later added taxim 0 200mg ... after taking medicines for 15 days there was no result but then basis amoebic serum test ( it came positive ) , Doctor advised metrogyl which helped to cure the problem... there is no stool with blood. My mom took metrogyl for 8 days along with nexpro and bifilac hp.... She is fine now ... Please advise if colonoscopy and any further procedure would be required in this case... she wants to avoid due to post covid weakness... her occult blood test is also negative now... metrogyl showed positive results in one day