Is she supposed to be locked inside her lab?

There is a riddle to answer to get inside her lab. unfortunately, i don't seem to be given a riddle when going to the door, even though now i have a reason to go in, namely that blasted potion for the 1st summoning test. i've clicked the symbol next to the door and it simply states that no one without a reason gets into the lab. am i missing something or is there a problem here?
<img src="/ubbthreads/images/graemlins/suspicion.gif" alt="" />