The bowl of gruel was eaten by her.

English as a Second Language English Vocabulary, Grammar and Idioms
1

The bowl of gruel was eaten by her.
Is the sentence natural to native speaker?
Is it better to use active voice?
She ate the bowl of gruel.

2

It depends whether you want to put the emphasis on the verb (was eaten) or on the subject (she). If you want to stress the action (was eaten), you use the passive. If you want to stress the subject (she), you use the active.

Alan

3

Thank you for useful help, Alan!