I've had some vortex diamondbacks 8x42 for a couple years now and think they are a bit hazy now over time, they were great in the beginning but maybe now I have a couple of quality gold ring scopes in the mix I can notice the difference.
Depending on the distance she would be using them would vary a bit on what magnification you would go, the first number is the magnification and the second is the objective(large end) size in mm just some info if you didn't already know, as the magnification goes higher any slight hand movement seems worse as in shaky, hence why a lot of people use tripod mounted optics when glassing with 15 power.
Cheers Reece