What does it mean when someone's "Bell Rung".......?

One day, the 7th grade Spanish I & II teacher, Senor Dona (Including ~ ) substituted our Woodwinds class. I later asked her about a former French I & II teacher, Madame Coffman. She said exactly this, "Oh, well you see, she couldn't be with us anymore, her...Bell Rung." What the fuck does that mean???? At first I thought it meant she died, then I thought she was pregnant and had a baby. Wha does this mean? Her Bell Rung?
 
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