When I was doing the pool sessions of my OW course, I figured that we were only 10' below the surface and that I didn't need to equalize. I thought this because I didn't see other people equalizing....but my ears hurt like hell! At some point during the session, my ears naturally cleared themselves....I wondered if this was normal (that my ears would hurt at only 10') or if it was because I've always had ear problems. Turns out that the greatest pressure change is from the surface to the first atmosphere (33 feet in salt water).
What I've found to be significantly more helpful than anything else is to pre-pressurize! Before I even leave my house to go to the dive site, I plug my nose and blow gently (to make sure that I have no congestion and to pre-pressurize my ears). From there, I pre-pressurize on my way to the dive site, while gearing up, and RIGHT before I descent....and then RIGHT after my head breaks the water. At this point, I have a jump-start on any equalization issues, and generally don't have any issues.
Of course, there will be days when things are a little more difficult....and I find that for the life of me, I cannot equalize in a head-down position. So suggest to your gf that she equalizes early (pre-pressurize, before even descending), often (every other breath or so on my descent is what I do), and in a head-up position. Tell her good luck....and she'll find ways to deal with her ears just as many other divers who have had equalization issues in the past!