I agree with the others. The fact you had an interview is always a good sign. Remember we have had Christmas between when you had your interview, if they have given you a date you should receive a letter by, then wait for this date. If you don’t have the letter by this date then re-contact them. The lady you saw cannot legally tell you who has been “picked” as a) this person may change their mind so then that would look really bad if it wasnt you and she told you this
there are other reasons she cannot tell you, but until you have the letter in your hand telling you if you have been sucessful or not, i wouldnt worry