Answer:
"Agoraphobia"
Explanation:
According to my research on different Psychological disorders, I can be said that Stella is suffering from "Agoraphobia" as well as a Panic Disorder. Agoraphobia is a form of anxiety disorder in which the sufferer tries to avoid any place or situation that might cause them to have a panic attack or put them in a situation where they feel trapped, helpless or embarrassed. Which based on the question is exactly what Stella is experiencing.
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