For the sentence above, firstly - you can check if the sentence is referring to the "he" or "she" by the "hiya" or "huwa".
هِيَ : she
هُو : he
If the word is hiya, it's always referred to the feminine gender (ie. she). If the word is huwa, it's always masculine (he).
Secondly, you check the next word. We see that the word "duktuur" دكتور is using "ta marbuTha" ة -> "duktuura".
This also indicates the feminine gender (ie. she).
Note: we cannot generalise that the "ta marbuTa" is a feminine sign in all cases or sentences.