Mrs Dalloway dislikes Doris Kilman because the latter tries to convert people, to believe and follow her church.

Clarissa thought,

“Did she not wish everybody merely to be themselves?

(Woolf, p. 116)

Related post:

This is the main book review https://booksreviewsandmore.com/why-does-peter-walsh-have-an-axe-to-grind-with-clarissa-dalloway/