Is it possible to hide IP address?

Technically it's possibile to hide your IP address by using HTTP proxy server.There are a lot of free proxy server on internet.You can also download the proxy client software which maintain proxy server list automatically.

How to hide IP address or make it appear as a different one?

Proxy servers like Tor will hide your IP, but it is very unlikely that the professor can see the IP of which it is submitted, and even if they can they more then likely won't be able to track where it is coming from.   If they ask her why her IP is so far away, tell her to say she was using tor a proxy server.

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