She later died of pneumonia in April 17th 2012 at the age of 92.

How old is Mummy Pig on Peppa Pig?

She is eight years old and wears a yellow dress. Since she is older than the other kids, she does not go to Peppa's playgroup and instead presumably goes to a different school. She and her family did not appear at all in series 5, but they return to series 6.

Who killed Mummy Pig?

Elise: Yes. Elise: (to Mummy) That won't help much (a beam of teal light shoots out of Elise's hands and the knife floats into the air and stabs Mummy Pig in the heart.) 999 Doctor: 999!