I remember this story, probably Podcastle, it was about Ada Lovelace and fairies.
At first she was a little girl and talked to and saw fairies, then she got sick/got better and couldn't quite see them anymore. All throughout she was convinced that she'd learn to fly/build a flying machine.
Story follows her till she's a young lady talking to Charles Babbage.
Anyone remember the name? My sister loves Ada Lovelace, so I realized I really need to get her this episode!