I never heard of the "Swamp Boogie Queen", so this is a bit of a reach, but it brings to mind Marcia Ball. She's a New Orleans pianist/singer with a vigorous style. I've heard her referred to as "Long Tall Marcia Ball" and the "Red Hot Tamale Baby" (or something like that). I could see her music being called swamp boogie due to the New Orleans setting and her technique. If it is indeed she, I'm sorry to hear we've lost her. Sorry I have no idea what record label she was on.