Saline is what is used to irrigate wounds and exposed organs in surgery, so it is the best and mildest thing to use. You can make some at home by boiling a quart of water and 2 tsp of table salt, then cooling it and placing it in a clean jar. A smaller amount is 1 tsp per 16 ounces of water, or 1/2 tsp per 8 ounce cup.
Amoxicillin or Aqua Mox is not available due to a shortage. Other antibiotics may be available online or from your vet.
Hibiclens chlorhexidene is available in WalMart in the first aid aisle. They also sell Equate First Aid Antiseptic, a brand of Betadine povidone iodine in the same aisle. Get some help to clean her wound until it becomes easier.