Hi Jill,
Have you checked the reviewers access level to ensure that the 'never inherit access to documents' option is not checked? If it is, this will prevent your reviewer from being able to automatically access documents / proofs on projects that have been shared with her.
If this option is selected, but you uncheck it, your reviewer will only start inheriting access to documents / proofs on new projects that are shared with her. She wont auto inherit access to documents / proofs on old projects. To overcome this you will need to build a document report to locate all of the documents needed and bulk share them with her.
Best Regards,
Rich.