Congratulations on your wedding. I'm sure it will be beautiful. Wish I could be there!
Heres the thing. You want to book air travel and an all inclusive resort in Jamaica on a certain date. Theres not many details the agent could really be involved in. An all inclusive is what it is. She gives you the price, thier brochure and phone number and the rest is up to you. She has no control over what happens there. Flights to Jamaica, well, you book, you fly. I don't think they could give you what you want. I dont think any travel agent is going to be able to accomodate your specific needs.
Only you know exactly what you want. I would go online, search for the resort you love and contact them. Ask if they have any packages that will accomodate your party that includes airfare. Compare that to booking the resort seprately from the flights. You will save yourself an agent fee and feel much more in control of the siutation.