oops, sent the pre-spell check/ editing version :P) here it is again.
Tell her to STOP using The Master Cleanse NOW!!!! Not all cleanses are safe for all people and this is defiantly one of the more risky ones because it includes a salt water prep. She is getting signs form her body to stop and she needs to, there are many other cleanses out there that are much safer! I have read many peoples accounts of reacting badly to the salt cleanse - not good.
She may have a serious electrolyte imbalance as a result of this and should take it really easy for a while. Good fruits and veggies are a nice place to start. If she goes to co-ops, they have packets of electrolyte powders which may help, or try gatorade. But if she eats potassium (like from potatoes and bananas),and magnesium & calcium, from foods this should help to balance the salt. Lemon juice in plain water 20 min to 1 hr before food can be a genital way of cleaning the liver.
Again tell her to stop the cleanse and if she is still reacting to see a doctor, salt reactions are nothing to mess around with. If she has a heart condition she should speak with a doc immediately.