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First. How did it become intertwined? What did she do to let the spirit connect with her?

Second. Are you thinking she is posessed by a spirit? And if so, why?

Next Series of Questions:
arrow Did she invite the spirit into her life, or did it just appear at random?
arrow What does the spirit want her to do?
arrow What does the spirit do when in control of her?
arrow Does the spirit make her speak in tongues?
arrow Does the spirit have a name?

Think of me as a (witch) doctor asking questions in order to develop a complete diagnosis of the problem.

Has she talked to a doctor, first of all? Or a psychologist? I don't doubt that your friend is troubled by this situation, but there could be numerous mundane and physical causes behind this. No need to assume it's a spirit. Not to be snide but I'm a big fan of mundane first. For a whole boatload of discussion on this EXACT TOPIC, check out this link. Also note that "owl_clan," also known as "Robin Artisson," is a registered idjit and troll. Take what he says with a grain of salt.

Only if the mundane avenues are explored would I consider her possibly possessed and in need of magical aid.

In any case, if you're going the magical route, I would suggest not focusing on REMOVING the other spirit, but rather bolstering your friend's own strength of will (or Will) power. I think that will be the safest way and will be the most beneficial for her in the long run.

What makes you think it is Egyptian? What phonemes are found in Egyptian which aren't found in any of the languages she speaks?

Has she been practicing any sort of spell craft or doing anything with the occult? Has she gone anywhere unusual?