How to keep others from seeing your email on iCloud?

My friend's ipod and her mom and brother's iphones are all synced on icloud. I think they get all the same apps and stuff
so if i were to make her a gmail account, and she used her mail app to access it, would her mom and brother be able to see her emails?
of course i could tell her to just go on safari but i figure this would be easier

Added (1). Ok what so are you saying no one else can see her emails (or even know she has one) unless it's linked?

Not unless you link the gmail account to her iCloud account.

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