Should I use my friend as my realtor?

Both are valid concerns. They may do an extra excellent job for you or the exact opposite. They could give you a reduction in cost or the exact opposite. Talk to them and express your concerns. It could be perceived that you do not "trust" them enough to help with something as important as your home sale. The other thing to keep in mind is the amount of experience the agent has.

As long as your friend the realtor fullfills her due diligence and contractual agreement as specified by the code of ethics and the board of realtors, there will be no harm in hiring her to represent you.