Re: What information does Win 10 slurp?
You can buy cheap ($20-$30) Pro upgrade keys from Kinguin.net
However, what do you mean by "logged into the laptop and told it what her Hotmail address was"?
What/how did you tell "it" (I assume you mean the laptop/Win10 OS) what her hotmail address was?
You didn't actually create a Microsoft Account and provide the email address as part of creating that account did you? You don't need an MS Account to use Windows, you can create a local-only account that requires nothing more than a username and a password to create. When the installation screen (or first time use if it came pre-installed with win10) asks you to login with or create a Microsoft Account, ignore it, skip/cancel/next, and then it'll ask about creating a local account. Since MS wants you to use an MS account, it's the first thing they ask about, but don't give in and create one,
Using a local only account gets rid of most (but not all) of the telemetry, the most personal telemetry. If you don't log in with an MS Account, the telemetry, while still troubling, is much less, generally non-personal (usually aggreated-type) information like what features of windows are used, etc. And even this can be gotten rid of with the right tools, like shutup10 as others have mentioned, or even, as I did on a recent laptop that came with win10 pre-installed, setting up an IP-MAC binding on my firewalls built-in DHCP server, and then put a DENY outbound rule so that nothing would go out until I'd finished 'tuning' (i.e. getting rid of all the telemetry) win10.