Here r some criteria:
1. Have u enough permission to touch her computer ! Cause, some changes necessary in her computer to get this facility
2. Have u enough Administrative rights. Cause some changes need for the same
3. Do u know her Login password !
4. She or administrator changed some rules on her computer.
There r no of 3rd party SW on the net, just googling out and do what do u want.
CAUTION: Before doing anything, be careful about ur data and also her data !
This is a delegation issue. The reason I can tell is you are receiving only her meeting requests and nothing else. This is a feature of delegation. Ask her to open her outlook, go to tools, options, the tab labeled “delegates” and remove you as a delegate from her account. She made you a delegate whether you are aware she did so or not. She may not have realized what delegation meant when she did it. This is the only thing that would cause the behavior you describe.