You could try PMing the staff, but with registration still buggy and on the fritz, there may be nothing they can do :c
Email accounts are fairly easy to set up, perhaps have her make a new one, make absolute sure it's spelled correctly, and wait for registration to open again. Try using an email name that doesn't look like Hamilon or Hamilton to avoid confusion, especially if the registration is looking at it as being the same or too similar (hence giving you the "already registered this session" error.