Most little ones at that age just learn very basics. You are right, her lessons will be on a lead and she will learn how to behave around horses, etc.
Most of the real learning to ride does not start until they have a little more control over their body and their attention span increases a little.
The best barn for a pip squeak is not always the same barn that will serve them best when they get to the more advanced levels. Keep this in mind when you are looking. There are some amazing beginner level instructors who admit that their abilities are best when it comes to the beginners.