Hey Tiffany :) In the paragraph you have provided, -'Pestered' is used as a past participle; -Grammar: It is a verb, however, in this paragraph it is used as an adjective and it shows the adjective use. -Meaning: To behave in an annoying manner towards someone by doing or asking for something repeatedly. - The function of the apostrophe (it is not a single quotation mark) reveals the old form of English writing which reveals that the vowel "e" is silent. Take note that this type of writing is not used in modern language, we use an apostrophe to indicate possession and contractions. I hope this helps. I am available for lessons should you need any further clarity :)

Can it be a typo? It should be an 'e' pestered, but I'm not sure that there's something else maybe used in literature. Is it in a book?

Pester'd = Pestered. It is just the past participle of the verb 'pester'. The apostrophe (') indicates that a letter is missing. The missing letter is 'e'.