Shoutbox

If she goes onto her Windows Live profile then she will see all of her updates, including display picture changes.

If she goes to the right hand side of the one she wishes to remove, a blue cog will appear and if she clicks on that she will have the option to delete the update.  This will prevent it showing on the "What's New" carousel in Messenger.

Any display names, personal messages and display pictures will get added to this and are only viewable by people on your MSN list.  You should avoid posting anything as any of those things that you want to remain private.