No, some people are allergic to PG. It is also "possible" that she is allergic to something in the flavoring of her liquid... possible. I am not allergic to anything that I know of...so don't really pay much attention to all that stuff.
But you are right in a respect. It really has nothing to do with ecigs. If someone is allergic to PG - then they are. But it is found in a zillion items. Or allergic to VG, or a flavor, or whatever. It has nothing to do with ecigs in general - or the act of vaping.
Oh for sure. I was just saying that this is the first I've heard of anything like this.