hi
so you interview is most likely going to be in Ankara and if everything goes well then they will request her passport and the next day she will be issued the visa....so congrats...u are almost there...also on the original form when u filled it out...there is a section where it asks will you require a translator? dont worry even they will ask you again if you require the presence of a translator.
one of our mutual family friends was required to have an interview also...it all went well
so good luck
and also what is your time line? when did you apply? and when did you turn in to inprocess? and does it says exactly on the notes that you are going to be required to do an interview???