That is the headline of the Spanish newspaper ABC at this link.
Why is she the nun of 10 Popes?
Because she has lived under all the popes from Pius X to Francis. She entered the convent on Holy Saturday, April 16, 1927, at age 19--the same date on which Joseph Ratzinger (who is her favorite pope) was born.
She is 105 years old and has been in the cloister for 86 years. She did leave once in 2011 to see Benedict XVI when he visited Spain for World Youth (!) Day. The newspaper reports that she holds the world record for time in the cloister.
She reads newspapers voraciously. She notes interesting articles for the other sisters. Apparently, her health has begun to worsen only in the last two years.
She prays very much for Benedict XVI--oh, what a good example for the elderly to pray for those younger!
Update: Sor Teresita has passed away according to a news report dated June 12, 2013. What a marvelous life! See link from Spanish press.
(Image from ABC under fair use doctrine)