Miep feels that way because she is shocked and disappointed by the day's events, as shown in the second answer option.
We can arrive at this answer because:
- Miep is scared and upset that Nazi officers have found the Franks' hideout and may be taking them to concentration camps.
- She has dedicated herself so much to helping the Franks and they know they are good people and so she feels very sad and apprehensive about everything that is going on.
- Her feelings were so intense about the arrival of the officers that she couldn't focus on anything, without even noticing the day going by.
In short, Miep was very affected by the arrival of the Nazi officers and the events of the day they arrived.
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