An interesting question.
Eveline asked God for guidance during the final scene. She then felt a kind of panicky drowning sensation. Having asked for divine guidance, she gives it too much weight. (It's not just anxiety, but feels like a message from God.)
This fits with her deeper character. When the story opens, she is sitting. She's still and tired. The last line of the story specifically tags her as "passive." This is a person who is inert. She does not move, and takes it as necessary that she stays where she is. The thought of change causes her to literally feel sick. It just isn't who she is.