former 2day fm host mel greig penned an open note to the media .
greig became infamous in 2012 when she was involved in a prank with her co-host which resulted in the suicide of a nurse in london two days later .
` have we not learnt enough from the royal prank call ? ' , greig asks .
she asks the media to be sensible when covering the birth of baby # 2 .
greig speaks of being on the receiving end of aggressive journalists and says that there are certain lines that should never be crossed .