you sound a lot like my sister too! She has been writing a story for a few years, I have made a few maps for her but she keeps changing what she wants. The last map I made for her was okay but it's been a while so not only have I learned a lot about cartography she has also changed a lot of her landscape.

This is the last map I did for my sister: map.jpg
sorry about the quality of the picture.

P.S. It's also nice to know I'm not the only girl on this forum