What type of irony is used when Anne Frank writes in her diary "In spite of everything I still beleive people are really good at heart"?

accendintal irony i belive, because she then goes on to write an example of Verbal Irony

When someone is being sarcastic, it is usually an example of verbal irony. Verbal irony is when a character says the opposite of what they mean. After hearing about some of the terrible things that Nazis were doing, such as deportations, work camps, and executions, Frank writes, 'Fine specimens of humanity, those Germans, and to think I'm actually one of them!' This is an example of verbal irony because what Anne believes and what she says are polar opposites. In this case, the Germans are not humane.

Apparently Anne was sincere, not ironic, and expressing a kind, loving view of the essential goodness of humanity. It is likely a misreading of her personality, perspective, and book to attribute irony to the above-quoted statement. However, if she were writing ironically, this type of irony is simply called "overstatement" ("intended exaggeration").