Okay this is the best I came up with – just instead of useing a spray bottle I think you could put it on a cloth and rub her down with it. To have “wet hair” I would suggest just a damp cloth. Can’t hurt to try. And for the fresh oregano I would just buy a packet of seeds and plant some in a pot for a little added decoration as well as a fresh supply. ;)
Mix ‡ cup fresh oregano leaves with 1 tsp. pure vanilla extract, and one cup of water. Heat the ingredients in a saucepan over low heat. Simmer for thirty minutes, then strain and cool it. When it has cooled, pour the solution into a spray bottle and spray it on clean, wet hair. It will keep for three days in the refrigerator. :D
Good luck!