doenetwork says that Ramona's DNA is available in CODIS. I guess you could check to see if it actually is? If it is, she most likely has already been compared to Princess Blue. It sure wouldn't hurt to check though!
The Doe Network:
Case File 158DFNC
Warren, date unknown (see attachment for photo)
Sybil Ramona Warren
Missing since February 1991 from Greensboro, Guilford County, North Carolina.
Classification: Missing
Vital Statistics
Date Of Birth: July 6, 1966
Age at Time of Disappearance: 24 years old
Weight at Time of Disappearance: 5'5"; 135 pounds
Distinguishing Characteristics: Black female. Black hair; brown eyes.
Dentals: Available.
Other: DNA available in CODIS.
Circumstances of Disappearance
Friends first reported Warren as missing to the Greensboro, North Carolina Police Department in February 1991.
Apparently, Warren had been voluntarily estranged from her family since 1986; that was the last time her loved ones received a letter from her.
Warren was possibly sighted in Tyson Corner, Virginia in November of 1995. A truck driver who was familiar with Warren from her time as a North Carolina resident recognized her near a shopping mall. He reported to authorities that Warren acted as if she did not know him. The witness also stated that she was wearing some type of work uniform and was accompanied by an unidentified male.
Investigators
If you have any information concerning Warren's case please contact:
Greensboro Police Department
336-373-2255
All information may be submitted anonymously.
Agency Case Number: 1991-0074740
NCIC Number: M-486383803
Please refer to this number when contacting any agency with information regarding this case.
Source Information: North Carolina State Bureau Of Investigation
http://www.doenetwork.org/cases/158dfnc.html
I did search for her online using her first name and her middle name. I found a Sybil Ramona Warren on Ancestry who had four children in NC, but I don't have a membership anymore so my information was limited. I know it is a long shot and I'm grasping at straws but she caught my eye so I thought I would throw it out there.