Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
indāgātrix, īcis, f. [indagator], she who searches into, investigates, explores: virtutis, Cic. Tusc. 5, 2, 5: avaritia latentium indagatrix lucrorum, Val. Max. 9, 4 init.: virorum, Non. 23, 1.