Even if she has been in the business for many years, she is not likely to be comfortable with all of the changes that are happening in the market or in the field of real estate because she isn't involved in it full time. Hire a full time real estate agent. Traditionally, real estate agents worked by themselves, with some support from a secretary or office manager who was also supporting 40 other agents. This single agent would work with both sellers and buyers, sometimes in the same transaction. A single agent would have the responsibilities of all of the activities that it takes to take care of both buyers and sellers.
Many agents still work by themselves and split their time between buyers and sellers.
The danger here is that you might be working with an agent who prefers working with sellers and really doesn't devote much time to knowing what buyers want, or your agent might have motivation to sell one of her listings over another home that is better for you. The team concept has become popular with agents in the last few years because it allows each person on the team to specialize in a particular function. The benefit to the client is that each team member is focused on his or her function and can do that exclusively, and can thus devote more time to each client. A good team will have a seamless integration of these functions, also. What is normally a strength can be a weakness if you feel like there are three or four individuals working with you, rather than one team.