Switching Microsoft Accounts

My daughter got her new HP Stream today and I remembered not to attach it to the WiFi network prior to setting up her local account. All that went well...

But then I went to switch it out of "S Mode", which meant signing into the Microsoft store. The only account I knew was the churches so I used it to sign into the Microsoft store.

We now want to get the churches info off her computer and use her Microsoft account and I can't for the life of me figure out how to make this simple change??? How can I switch the Microsoft email associated with her local account?

I was thinking of deleting her account and creating her a new one, but that will undo hours of setup I did today...

Try How to Sign in to Store with Different Microsoft Account in Windows 10

That's interesting, in my effort to rid the system of Microsoft bloatware, looks like I removed the store from her computer.

What's really strange is I've managed to sign it into her own One Drive account, but it still shows the churches files???

Why does Microsoft make this stuff so hard???

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I created her a new local account so it seems to be playing fair right now, but Microsoft sure makes it hard to change account settings.