See, if you like it, now you can thank her for suggesting it and if it suits you, you can tell her that you have firm boundaries and never mix business with personal healing pursuits. :) That way she'll know she's done something useful and that you're not going to go to your own clients for that sort of thing either.

I'm personally big on things not interfering with established relationships. Whether or not you enjoy the Reiki, it still won't reflect on the naturue of your existing relationship.