Trying to locate son's half sister, April Danielle. Don't know last name.?

"Dani" 's mother Cheryl (Wagner) married Lawrence Croslin in Poteau, Oklahoma in early 70's. They lived in/around the Ulysis, Ks area. They divorced when Dani was still a baby. Cheryl remarried and new husband adopted Dani. Don't know Cheryl's married name. Pretty sure Dani does not know anything about her "family". She has several brothers and a sister she does not know about. Dani should be around 37 years old. I think she was born in 1972. My son is the youngest of 5 children born from Lawrence (Larry) Croslin. He is 26 yrs old; Dani is the oldest. Then there is Casey Lee Gomez, David Owen Tisington, Brandon Haws and my son Lawrence "Owen" Croslin, Jr. Lawrence (Larry) has since died in 2005. If anyone has any information, please contact me at my email address - cyndi.hendrix@sbcglobal.net or at 918-426-6713. Thanks so much...........Cyndi Hendrix