If she only offers GFE, that means she does not offer CIM.  There may be other little differences, but that's the main difference.

I've been under the impression that when greek is included in the session that is typically advertised as a PSE experience. But there's people who consider a PSE experience to be dirty talk and cof and a more sexually charged time similar to movies and what happens in them. This is the first time I have heard of a GFE plus session to include Greek but I suppose it's more black and white when you are dealing with an agency that you are familiar with what they consider the acronyms definitions.

I've always offered CIM and when I started I was told that a GFE session meant msog was on the menu as well as bbbj with cim. So I have heard lots of different definitions of those things. I personally prefer to have a potential visitor ask me about the services that he is looking for after he has been screened.  

The menu list on here and p411 makes it easier for both parties I think and looking at reviews to see what services are offered by the provider. I have always wanted to list my menu options and details on my site but I think that if I do that it could possibly come back to bite me in the butt. It can be quite confusing

As Xyonyg noted, and I've never heard of an asian provider in an agency offering greek.