its pretty obvious to most people that foreigners speak english with a weird accent....her accent only makes her sound really posh which she isnt...and for some reason she liked to tell us off in english and didnt make much sense.
It's likely that your teacher began learning English in the British system (not surprising, as most Europeans learn this way) but didn't go too far after the pronunciation classes. When people do this they gain half a BBC (English RP) accent without the proper phoneme manipulation that should go with it. Then they sound posh and uneducated at the same time.
Is her accent more geared to British (English RP) or American? Because if it's RP then it's likely she got her accent from the BBC international service (the only contemporary use of the RP). If American then I have no idea, anyone can teach "Eeenglish" over there.