I work in IR where we occasional remove tubes. These are the instructions I give:
Change dressing as often as needed if bandage becomes soaked. Nothing by mouth for four hours following tube removal.Use food coloring to dye any food before eating. Eat only very lightly after four hours. Limit the amount of liquids until you are certain there is no leakage from the tube site. If food contents (dye) are seen to leak from the wound site, stop eating/drinking; wait one hour; repeat the trial. Only small meals should be eaten for the first 48 hours to allow the stomach to close. Larger meals may stretch the stomach and prevent closure of the wound. The wound may continue to seep for several days. This is normal and should not be concerning unless food/liquid continues to leak. If so, call your doctor. Change the dressing as often as necessary to keep the wound site dry. Once there is no longer seeping, no dressing is needed.
Try a food dye and see if it comes out the wound where the g tube use to be. Also make sure her diet isn't crazy with heavy solid food.