How Would You Feel About Training Another Employee?

I work at a CPA firm and I paid to become a QuickBooks ProAdvisor, out of my pocket, and completed the course on my own time to become certified.
Things have been slow at work and my boss asked me to load the company QuickBooks onto another employees computer and to give her some pointers on how to use QuickBooks.
Am I wrong to not want to show her how to use QuickBooks? Am I being selfish?
I became certified hoping to get more work – which I have – and hopefully to get a raise – which I haven’t. I wanted to find a “nitch” were I could excel in something that would be beneficial to the office and our clients.