Every provider is different...and every provider/client combination is different.  I've seen some list GFE+ as something in between GFE and PSE (ie - a more wild GFE but not quite to the PSE level).  I've seen others use GFE+ to mean a trip to the islands of Greece is included.  For others, this might just be "clever" marketing to get you to pay more for the same (I'm not saying...I'm just saying).

If the lady is reviewed...I'd check out her reviews and that should give you a better idea.  You can even PM others that have seen her to get their input.  Just don't assume that because Johnny Twodicks got a particular service from Veronica Doublevag...that you will also receive the same.  It's a YMMV world out there.
 
For me, I tend to lean toward ladies that charge a rate for time...not necessarily a specific set of services.  The two of us can work that out BCD.  It's worked out for me so far...even though I'm a bit of a newb myself.  

GFE+ could mean BBBJ, versus CBJ, or it could mean she charges an upcharge for any number of other services, including anal, but it could be MSOG, CIM, COF, or lots of other things, all the way down to DATY, FIV or DFK.

Or it could mean nothing at all. As previously remarked, read the reviews, and the web site or her ads may also give a clue if you look carefully. After all, she wants you to pay the extra and you are more likely to do so if you know what you are buying.

zig

There is no standard definition of GFE.  If you ask three people what they think GFE is, you will get four answers.