The parents of a British teen, who died suddenly two months ago, received a disturbing letter from the girl's high school saying she needs to improve her attendance or can't go to the prom, the Manchester Evening News reported.

The letter said Megan Gillan's attendance was 60.4 percent and the school requires its students to keep a 92 percent attendance record.

"I screamed when I first saw it," her mother Margaret Gillan told the newspaper. If they want her to attend that much I'll take Megan's remains. It's disgusting."

Gillan was found dead Jan. 19 in her bedroom at her parent's home. The letter was dated March 16.

"Megan would have loved going to the prom," her mother said. "She planned to go with a group of friends, she was really looking forward to it."

A school spokesman apologized and told the Manchester Evening News, "that letter should not have gone out," and blamed it on a "software error."

Click here to read more on this story from the Manchester Evening News.