Switching Severs?

My friend has just started playing and after getting to the first boss and requesting help i've noticed that she isn't on the same server as me. Is there anyway she can change servers? even if it means starting again? What if she deletes the app and re-installs it?

At this time, there is no way to create a new account on a new server or to switch servers. If you have multiple devices, it is possible to create a new account, but there is no guarantee you'll end up on your friend's server.