She can boil it in the water and coconut oil at the same time. The cannabinoids (THC, CBD, etc.) will not dissolve in water, you need some oil.
The easiest recipe would be to dry it then throw it in a crock pot with enough butter to cover it. Add some water to the mix and let it go overnight. Strain it through cheese cloth and put the mixture in the freezer. The water will freeze into ice and can easily be removed from the plant matter.