Bad nappy rashes during diarrhoea

Hi, my girl is 8 months this year. Believe she caught a virus at her infant care and having diarrhoea. We have been cleaning her and changing her diapers often, not sure if it is what causes her nappy rashes to worsen. Understand that we should keep the area clean at all time. FTM here, I am not sure if I should not put on diapers for her at the moment (worry it may expose her to more bacteria), because she’s getting very and super irritated and cranky every single time we change and wash her down, and also her rashes does not seem to subside. On a side note, we bought her to clinic and were told to continue upkeep hygiene and also to continue to apply diaper cream on her (as per usual), but apparently we realise it worsen as the day goes. Seeking some advice for any parents that have any suggestions or any experience on it. Thanks much in advance.