Hi, Dancer. I know it doesn't smell so great, but it really helps to put vinegar on it. It really helps to take the burn out. You just put it on a cotton ball and rub it on her. You're a very sweet sister and if you try this, I hope it helps.
I know that you've probably heard the aloe vera thing A LOT...believe me...but it really does help if you keep reapplying it. If you store it in the fridge, it can give you more of a relief when you first put it on.
Ice packs (in small amounts of time) and cold cloths or compresses will also help to minimize the length of time that you have redness and should help with the swelling.
Take lukewarm (room temperature) BATHS. Taking showers with too high of a water pressure could increase your pain. Taking a too-cold bath won't help, and will make you freezing. And a too-hot bath runs the risk of burning you even more, or irritating the burn that you already have.
Make sure that you drink PLENTY of water, in order to keep your body hydrated so you don't develop a fever. If you do develop a fever, take an acetaminophen or an ibuprofen to help get rid of the fever and to minimize inflammation and swelling.