You should certainly wait until the reiki work has run its course -- say, a week or so -- before having anyone else do healing work for your daughter. I don't think there's any risk of overloading, but crossed wires? You betcha. I would be delighted to send positive energy to your daughter in a week, however; it would help if you could give me her first name and a photo, since that makes it much easier for me to aim and focus the energy.