I don’t understand

How Monika’s will and temperament turned 180 like it did.

In the beginning it’s clear she wants to be financially stable and have fun; her remark about how good beautiful women have it.

When she and Harry is on their summer vacation, she hints at wanting a regular nuclear family life. Being married and having a baby. They realize they can’t raise a child in nature.

However, is the one who does not want to go back to the city. At the same time, in the beginning and the end, she wants to live a city type of life, doing modern young adult activities.

How did she go from wanting a baby and husband to not caring about either so fast?