Yes ... although to be honest, if she finds out that you've been spying on her she wouldn't be too happy ... respect her privacy ... but what is a 13 year old to interfere with matters way beyond his experience
Anyhow, you can have a remote desktop connection ... there are programs out there which enable to look at her screen and so forth ...
ask her instead of checking it out.
If she says no then say that u are sorry but u would like to see her email right now.
That should do it.
But well there is a few ways, u could just hack into her email and then see what mails she has been sending&recieving.
But instead of hacking to her email u could just install a keylogger or something of that nature to her pc. This would be much easier to do than hack into an email account.