Based on the described scenario, it is most likely that Kaylee is suffering from specific phobia.
What is a Phobia?
This refers to the fear of something that is sometimes irrational and causes weird behavior and is diagnosed to be a psychological problem.
Hence, we can see that based on the fact that Kaylee is scared of snakes and as a result, avoids outdoor activities, and does not even spend time alone in the backyard, she likely suffers from a specific phobia.
Read more about phobias here:
https://brainly.com/question/738362
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