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Larkin spent the next morning playing with Sophie. But she felt worried. She walked through the field and over to a small cemetery.

Hi,

Is "and over" in the above optional? If not, why not? Thanks.
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The words you wish to omit show that she walked farther.
Comments  
Optional grammatically, but it adds distance to her perambulation.
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Mister MicawberOptional grammatically, but it adds distance to her perambulation.


Thanks, Mister.

But I still don't get it! Would you throw more light on the bolded part in your reply?
Did you look up the words you don't know?
Yes.

But it didn't help!
Students: We have free audio pronunciation exercises.
 Mister Micawber's reply was promoted to an answer.