Good Morning all

Just a quick query

A client of mine has been hired at a company, she has signed her contract and she has received a letter of appointment from the 1 Sep 2013.
A new position has opened up at the same company that she believed would be better suited to her.

Would she able to apply, should she go in and discuss it with her new HR Manager, or leave it as is

She asked me for advice and I honestly don't know