When I was a beginner, I requested to get to know the horse first. I hung out in the stables, got to know the horse I'd be working with and groomed him. I chose not to go on a lunge line, but for more nervous riders, this might be a good idea. Having that "connection" is helpful in calming their nerves.
When she gets on, she might have to endure a walk for awhile until she gets used to the horse. After I loosened up, I graduated to a jog, a trot, etc. The first few lessons were monotonous because I felt I needed to get used to each gait. That long transition was very helpful.