allow somebody to access/edit only my calendar (and not my email)

I have an iCloud account. My secretary does not. I would like her to have the ability to access my iCal Work calendar and add events. I do not want to have her access my iCloud email.

Since I could not figure out how to have her access my calendar only, I added her Gmail account to my iCal and had a new iCal account "Sec'ty Gmail." She can add and edit events in that calendar, but when she sets alerts on the gmail calendar, they do not work in iCal. I rely heavily on alerts to remind me of events. [i have yet ot find a workable solution to this problem] Thus, I have to go into the event, move it to my Work iCal calendar, and set the alerts. THis defeats the purpose of having my secretary create it.

I'm wondering if there's a way to allow her to view AND EDIT my work Calendar on iCal. I know I can share a read only version on iCloud, but that doesn't help.

If you have any possible suggestions (including solutions to the gmail/alert issue), I'd like to hear them. Thanks in advance.