No, I do not believe SCUBA is for everyone. Some people are simply not comfortable with the mechanics, or technologies involved. My wife would not even consider trying SCUBA just for having looked at the equipment. Although to most of this forum group it may seem that there is not much "technology" to scuba it is more then some people are able (or willing) to deal with.
To the point of the diver you mentioned, the obvious question is how did she get pass basic scuba certification without being able to clear a mask. I don’t believe that instructors need to, nor should they brow beat students, but some skills are essential and need to be mastered.
Overcoming problems is always possible if you are willing to work at them. My dive buddy has fought every bad habit, fear, seasickness, and equipment problem you can dream up, still over time he has managed to become a proficient diver all with out drowning himself.
Scuba is a great sport with mostly everyone willing to help each other and new divers along the way. So kudos for you for stopping to care about and help another diver. Sounds to me like she needs you as a dive buddy.