to a motion she made (the verb "duck", the subject of which is the objective pronoun "her", object of the verb "saw").
tʊ ɐ mˈoʊʃən ʃiː mˌeɪd ðə vˈɜːb "dˈʌk", ðə sˈʌbdʒɛkt ʌvwˈɪtʃ ɪz ðɪ ɑːbdʒˈɛktɪv pɹˈoʊnaʊn "hɜː", ˈɑːbdʒɛkt ʌvðə vˈɜːb "sˈɔː".