Explanation
The present perfect tense indicates a past action which is not defined by the time of occurrence. The contraction 'She's' implies 'She has' which indicates a past action. The adverb 'already' is used with present perfect tense. “Still” is used to talk about something that hasn’t finished – especially when we expected it to finish earlier and usually comes in ‘mid-position’. However, in this context is incorrect as the option should have been “still eating” to indicate the action which has not finished. Yet is used in negative statements and questions, to mean (not) in the period of time between before now and now, (not) up to and including the present. “Yet” is usually placed at the end of the sentence, thus it is incorrect in this context. So, option A is correct.
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