The best option to fill in the blank is 'She,' as it correctly represents a singular female subject looking to do homework alone. Other options like 'They' or 'We' are either plural or represent a group of individuals, which does not fit the context. Therefore, 'She' provides the clearest meaning.
;
The correct subject pronoun to fill in the blank is 'She', as it suits the context of the sentence. 'They' and 'We' do not accurately represent a singular female subject wanting to do homework alone. Thus, 'She' is the best fit to convey this meaning. ;