Google accounts and lollipop update

Hi, if someone could help me out with my question I would be really grateful, I haven't updated to lollipop yet-if I do, will I have to sign in to play store/Google+/Google photos etc from the start again, I don't mean a new account, I just mean basic signing in, probably just the once?.
I ask this because my daughter(11yr old) signed in to her Google account using my phone once, to download a game to play when her hudl needed charging, ever since then I can see her installed apps if I click...

Google accounts and lollipop update

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