Pupper lover has given some excellent advice. My addition would be that you should carefully try to gain her trust and teach her that not everyone is out to hurt her and show her all the love you can. It's the only way you can begin to heal her emotional wounds...and make her painful past merely a distant memory!

Things such as fireworks will be more difficult since they don't occur all the time but chances are she will be afraid of thunder and lightening storms also. Do as Pupper Lover said and don't coddle her but perhaps try to devert her attention to something she loves such as a toy or a game you know she loves to play with.

Interacting with Huney in a soothing, kind, patient manner can help maintain her calm. Since Huney shies from a particular object, in this case water, you might be able to counteract the situation. Introduce the object to her gradually--I like the idea of having her watch from inside the house. Have her watch there at least once daily or every other day for awhile. Reward her with affection or a treat when she doesn't run from it. After she is comfortable in this scenario, introduce her to the water element outside the house. Just do it slowly. You must realize though that what you are hoping for is for her not to run when the water is on. She may never love to play in it and if this is the case you need to be ok with that. There are a lot of dogs who have not be abused who hate water too! You can check the AKC website to see if Chows are usually fond of water or not.

Best of Luck with her.