1900 Lincoln, Putnam, MO Mary Burns, b. IA Jan 1845, married, had given birth to seven children but only six alive in 1900, no occ Hettie Pannts, dau, b. MO Dec 1867, married, had given birth to four children, all alive in 1900 Royal Pannts, son, b. IA Feb 1886 Jessie Pannts, dau, b. MO Jan 1889 Bell Pannts, b. MO Sept 1891 Baby Pannts, dau, b. MO, 0/12
Their neighbors were John, Mary and children Points.
I think Hettie was your Hettie Points living with her mother. Since she was born in Putnam Co. and in 1900 living in Putnam Co., I'd look for her marriage license in Putnam Co., MO.
Hettie and Peter didn't stay in Oklahoma.
1920 Kokomo, Beaver, OK Pet E. Erickson, b. IL, 55, general farmer Hettie E., wife, b. MO, 52.
1930 Richfield, Morton, Kansas Pete C. Erickson, b. IL, 65, carpenter Hettie, b. MO, 62.
1940 Richfield Hettie Erickson, b. MO, 74, education=8th grade, old age assistance department social welfare.
You can pursue her death in Kansas. Her obituary might contain more information about her early years. Successful Searching!