I really feel you on this, having a sick baby with so many things going on at once is just so draining for everyone. For diarrhea, most PDs will suggest going back to bland, easy-to-digest foods like plain porridge, steamed carrot, or banana, and holding off on anything acidic or strong like onion juice for now since that could be irritating her tummy further. It might be good to bring her to see the PD soon, just to be safe, especially since the diarrhea has been going on for a week and she also has the diaper rash to manage. A week is a decent stretch for a 9-month-old and the PD can advise properly on whether to continue the AGO as well.