World-of-warcraft – How to switch between walking and running

I don't think money rates have been nerfed in general. Although, I think some mobs in various places (including Silithus) have been made non-elite, when they were formally elite, and as such, their drop values have probably been lowered. It does depend on which mobs you're referring to, and I think that, for the most part, things are the same.

Practice and concentration on the new controls. It just takes a while (3 weeks?) for something to become a learned behaviour.

It might help to avoid stressful situations at least during the early part of this period. When stressed we revert to what we think we know best. This is why you wash your windscreen when you meant to flash your lights when someone cuts you up when driving as your previous car's controls were the opposite to the one you have now.

So if you are engaged in guild raids - which sound stressful - your wife is more likely to revert to the previously learned behaviour (keyboard turning). With enough non-stressed practice at looking with the mouse she should be comfortable with it when it really matters.

Just to add something I posted as a comment on another answer:

Minecraft can be played in peaceful mode with no enemies and has the "classic" keyboard and mouse controls so might well be a suitable training environment.