Horror at the Haunted House (Vintage Paperback) by Peg Kehret

It was a job any kid would kill to play a role in the Historical Society's Haunted House Halloween fundraising event. Ellen Streater was thrilled to play Joan of Arc, burning at the stake. It was for a good cause—to benefit the eerie old Clayton House, soon to reopen as a museum. They said the house was haunted. Ellen didn't believe it—until she felt a strange, icy feeling when she touched the beautiful Fairylustre bowl. Then she saw the ghost in the mirror—a beautiful phantom who beckoned her into a nightmare beyond her wildest dreams.
 
"Entertaining and appealing, with lively and believable young people and a personable ghost." — School Library Journal