In English I believe this is incorrect. The gerund refers to the subject in the other sentence, so this sounds as if whoever knocked on the door was also getting ready for the party.
In Spanish if it is correct - how do we know it refers to ella? Based on context?
the English has been corrected in order to be more accurate as you suggested.
In Spanish you would have to guess by context, yes, as it could be referring to either subject.
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