Well, if she's ok with silicone lubes, or even a specific brand of silicone lube, they do make great massage oils, so you can get something that works on her intimate areas and then just use that everywhere from the start.
Other than that, don't have any specific suggestions, but do look for ones that don't use natural oil extracts, as while they smell great and feel awesome on the main part of the body, they can be quite irritating.
And alternative is to use latex gloves, or some form of disposable gloves that she won't have a reaction to, so you can just slip them off when you want to finish her and be confident you have no residue on your hands.