"Is she on the heavy side?" No, thin, petite.
"Does she work out?" No! If she does it would be very little!
"Does she sweat all over or just the hands? Or an isolated part of the body?" Hands, Feet & underarms
"Does she take any medicines?" No
"Does she have any other symptoms?" No, not so far as I know.
"Hyperthyroidism could be a cause of sweating, does she have any other hyper-T symptoms?" I've asked a few questions, and so far no...will find a list of symptoms and ask her more questions.
"Cold hands after sweating could be a side-effect of releasing heat through sweat" She did say her hands are cold regardless of sweating.