Sharon is Amelia Pond's aunt. She became Amelia's guardian in 1996 or some time prior, and moved with her to Leadworth when Amelia was young. (DW: The Eleventh Hour). She took Amelia to the National History Museum, where she dragged around it until Amelia ran away and found the Pandorica. After Amelia went into hiding, Aunt Sharon looked for her, but ultimately failed. It is unknown waht she did after this, but was presumably wiped from time due to the T.A.R.D.I.S. exploding.
After the Universe was restored, Aunt Sharon attended Amy's wedding and witnessed the return of the Doctor. (DW: The Big Bang).