Also, how long would it be before this spell wears off, and what would happen if I tried to get someone else to reverse it? Not to bind her to me, but just to bring back things to normal.
Many thanks for your help.
No... I don't believe a love/binding spell can be so powerful as to prevent her from seeing physical reality. If your ex is acting like a "mindless zombie" then it most likely has more do with the mundane world (like mental dis-ease, drugs, alcohol, etc.) than the magickal world.
I have no idea if a spell was actually cast so I can't answer your question about the length of time the spell/binding might last.
Unfortunately, sometimes it's easier to believe that someone we love has been taken from us via a spell than to see that maybe she decided to just walk away. People change and they don't always change for the better.