Dolores Harper Lackner of Pricedale died Thursday;June 21;1984;at 5 p.m.in Allegheny General Hospital;Pittsburgh;as a result of injuries sustained in a hit-and-run accident on Tyrol Blvd.three months ago. She was 54.  She was born July 9;1929 and was Protestant by faith.   Mrs.Lackner is survived by a son;Alex Lackner Jr.of Pricedale;a daughter;Alexis Marie Hepple of Pricedale and four grandchildren.  Friends will be received at the Howard W.McCrory Funeral home;Fayette City;on Sunday from 2 to 4 and 7 to 9 p.m.and on Monday until 10 a.m.when services will be held at the funeral home with the Rev.Bruce Smith;pastor of the Belle Vernon Christian Church.  Burial will be in Belle Vernon Cemetery.  The Howard W.McCrory Funeral Home is handling the arrangements.