I know I’m not Sonya, but I thought I could assist you with your question.
For a five yr. old there is no need for a curriculum. Just start the nature artwork in a whatever notebook or free form paper you like. Creation walks with you carrying the nature guide so she can start her onservation skills and learn to love G-d’s Creation. Lastly, just read books to her about nature. The books from Clara Pierson are perfect as maybe The Sandman stories of farm life. All of these should be found online for free. http://www.yesterdaysclassics.com
There are also some resources for that age group from Answers in Genesis to get her started on her worldview and facts about the Creation of the world, etc…
Lastly, the Backyard Scientist series has a few scientific experiment books for ages 4 and up and a new one for ages 2-7. Look at your library for those, for financial relief.
Lastly, just read to her wonderful living children’s books, like those written by Arnosky and McClosky for example, with beautiful illustrations of nature; show her Impressionist paintings which are nature based.
HTH,
Rachel