Well what is her budget? Most bang for her buck would be turbo. Second best would maybe be an engine swap.
CAI should give a little more than a short ram intake, thus would be the way to go. For CAI I can only recommend AEM, although I'm sure other people may recommend other brands such as DC. Other cheap ways would be header, exhaust, and pulleys. Once you add up the price of all that stuff, though, it's not so cheap anymore.
Not to mention that she won't really get a lot of HP out of all those mods in combination. Every little bit helps, but it really depends on what kind of performance she's looking for, and what her budget allows.
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