In "journey of the center of the earth" why can't gretchen go on the trip? ?

"Journey to the Center of The Earth" by Jules Verne is one of author's own loved book.

Explanation:

In the novel, Otto Lidenbrock, who is a professor in geology and mineralogy decides to take the journey to the center of the Earth. He finds an encrypted message of alchemist Arne Saknussemm and de-crypts its with the help of his nephew Axel. They both decides to take this journey together. But Grauben, decides to stay back and wait for them to return because after their return Axel and Grauen can marry. Because after their expedition, Axel would be man. She encourages them to go on this expedition as it will be great for both the man.

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