Dying Lavender HELP
I got a big lavender bush the beginning of the spring. It was recently doing GREAT, beautiful flowers, amazing fragrance. We left for a short trip over 4th of July weekend, during which our neighbor watered for us, and when we came back about 1/4th of the plant was dark grey and shriveling up. I thought maybe a cat pee'd on it. We cut off the dead parts, figuring it would be fine. Well a few days later now more of the plant is dying.
I probably overwatered it, but don't know what to do to stop the death and help save this quickly dying plant.
If I were to take cuttings from it, how do I do that? I'm a beginner gardener (obvious by my killing of the lavender bush)and need all the help I can get.