Police were called to a home in the 500 block of High Street in Norristown on Thursday after someone called, concerned for the well-being of the residents.
Upon entering the home, investigators say they found Donna Smith and her four-year-old daughter dead.
Police say they also found an empty bottle with a Xanax label, and a suicide note nearby.
Smith's family told police that she had a long history of personal problems, most recently having been the victim of domestic abuse.
An autopsy on both Smith and her daughter are planned for Friday.
Get Action News on your website