What is the whole story about that nun who hung herself on the third floor of sacred heart,palo alto,Cal?

Hi um at sacred heart in palo alto California I heard that the reason some people don't let us go to the second or third floor is because a nun hung herself on the third floor because she was pregnate and they buried the baby under the circle in the middle of the school I just wanna know the WHOLE story can someone tell me it plz! Thank you