What were the options that Sophie was dreaming of? Why does Jansie discourage her to have such dreams?

Explanation

Sophie dreamt of opening a boutique or becoming an actress or a fashion designer. She thought that she would be offered the position of a manager and that she would work there till the time she saves enough money for her boutique.
Keeping in mind their lower middle class family background, Jansie discourages Sophie to have such dreams. Jansie is more realistic and practical in life, and hence, knows that big ambitions cost heavy investments, something their working-class status could not afford.