I would not flush after today. Pencillin G dosage is 1/4 ml given as a shot 1/2 inch into the breast muscle for 4 days is good. Make sure she is drinking water. If you have any electrolytes you can use it for today. Here is a recipe:
HOMEMADE ELECTROLYTE SOLUTION
1/2 teaspoon salt substitute*
1 teaspoon baking soda
1 teaspoon table salt
1 tablespoon sugar
1 gallon water
*Salt substitute is readily available in most stores in the spice aisle near the salt, but if you do not have it, don't worry, the solution will still have most of the benefits intended to combat heat stress
HOMEMADE ELECTROLYTE SOLUTION
1/2 teaspoon salt substitute*
1 teaspoon baking soda
1 teaspoon table salt
1 tablespoon sugar
1 gallon water
*Salt substitute is readily available in most stores in the spice aisle near the salt, but if you do not have it, don't worry, the solution will still have most of the benefits intended to combat heat stress