ISO Birth Mother Thelma Allen from Kansas City, Missouri to a daughter born 10/3/1959

I am a female adult looking for my Birth family. I was born on 10/3/1959 in Wichita, KS. This adoption may have been done privately between my birth mother and an attorney. Any information would be appreciated. UPDATE: I have found out that my mother's name was Thelma Allen from Kansas City, Missouri and traveled to Wichita, Kansas to give birth. I'm now looking for her and possible sisters that I may have. Any information would be greatly appreciated. Thank you