The best way to learn how to do an accent is to listen to it. The above link is helpful for specifics, but it can be difficult to translate. I would recommend starting with videos of the real Miep Gies! Here is one where she speaks in English.
Here is the official pronunciation guide from the back of the script! Correct pronunciations will help you form more of an accent for your character. I will include some auditory guides in order to add to your knowledge of pronunciations as well.
Pronunciation Tips
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