Shirley Raines — also known as activist and founder of Beauty 2 The Streetz, “Ms. Shirley” — passed away from hypertensive heart disease.

Shirley’s daughter Danielle confirmed the news to TMZ … telling us Shirley had a history of high blood pressure, which she was being treated for at the time of her passing.

A private service is scheduled for next Monday … while a public one will be held at a later date.

As we told you … Shirley was found unresponsive in her Nevada home late last month during a wellness check. She was later pronounced dead.

Raines rose to prominence after founding Beauty 2 The Streetz — a non-profit that provides beauty and hygiene services to people living in the Skid Row area of Downtown Los Angeles

The rest of the team behind B2TS released a heartfelt statement in Shirley’s honor after her passing … saying, “Her legacy will continue to live on through the work she started and the hearts she touched.”

Ms. Shirley was 58.