Calendar delegates acceptance

I am the delegate for my boss's calendar, I accept the
appointments from other outlook users in our network. A
meeting has been rescheduled several times, so the time
that is available I accepted, the appointment did not show
up on my boss's calendar. She deletes the appointments
without accepting or declining (that is why I accept them
so that she does not have to). I'm not sure what to do. It
usually works but this one instance it did not. Is there
another way? Am I missing something?