why would apple webkit be on my gf phone

WebKit was originally derived by Apple Inc. from the Konqueror browser's KHTML software library for use as the engine of Mac OS X's Safari web browser, and has now been further developed by Apple, Nokia, Google and others. WebKit is a layout engine software component for rendering web pages in web browsers.

If you have not jailbroken your iPhone, there is nothing wrong with anything that you see

Jailbreaking is an intentional act by a person physically possessing the iPhone. That's about all I can say about it or else this thread will go POOF

Google it