Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
accūsātrix, īcis, f. [accusator], she who makes accusation against any one, a female accuser (v. accuso no. I.): tu mi accusatrix ades, Plaut. As. 3, 1, 10; so Plin. Ep. 10, 67; cf. Prisc. Op. Min. 102 Lind.