Yes! Anyone can SCUBA dive as long as they have the desire to do it.
Like the lady you were talking about, I had major issues clearing my mask when I was a student. It took many hours in the shallow end and more than one Open Water class before I mastered the mechanics of it. (I’m a big-time nose breather even now.) Eventually, I got good at it and now I teach SCUBA.
Finally, whatever you do DO NOT let a diver like this go deeper to try the skill. Worst case: she could panic, hold her breath, shoot to the surface and DIE of a lung overexpansion injury. Even 10 feet of water adds 1/2 an atmosphere of pressure.
If she is a friend of yours, her best bet is to get one-on-one attention from a Dive Master or Instructor so she can get the help she needs and stay safe.. If she’s on Dive Buddy, you can have her contact me. I live in the area andoften go to Vortex and can show her the way I learned to clear my mask.