That's the one case I know of.
Here are the names of more women that killed the children of others:
Cathy Lynn Henderson currently sits on the Texas Death Row for killing a child that is not her own.
http://crime.about.com/od/female_offenders/p/deathrow7.htm
Name Kills Survivors Context Modus
Phan Thi Ai 3 lover's children burned
Maria del Rosio Alfaro 1 9 year old girl stabbed
Beverly Allitt 4 22 Pediatric Nurse Injection
Melanie Anderson 1 girl 2 beating, torture
Gertrude Baniszewski 1 girl 16 tortured, beaten
Mary Flora Bell 2 1 playmates strangled
Barbara Briggs 1 grandson beaten, starved
Linda Burnett 1 stranger shot
Sally_Clark 2 infants (crib death) smothered
Patricia Coker 1 foster-daughter beaten
Betty Coker 1 foster-granddaughter beaten
Mary Ann Cotton 4 stepchildren poison
Minnie Dean 2 (3+) ? baby farm smothered
Nannie Hazel Doss 2 grandchildren smothered
Lillie Easter 1 foster son beaten, drowned
Marti Enriqueta 6+ 1 "magic" boiled, eaten, rendered into "potions"
Ellen Etheridge 4 stepchildren poison
Sandy Evans 1 adopted daughter child abuse
Christine Falling 6 babysitter smothered
Lynne Friend 1 guardian beaten
Caril Fugate 1 baby sister choked
Janie Lou Gibbs 1 grandchild poison
Veronica Gonzalez 1 neice age 4 tortured, scalded to death
Ester Rebecca Griggs 1 exorcism beaten
Belle Gunness 1+ stepchild
Bonney Heady 1 kidnap victim shot
Cathy Lynn Henderson 1 boy 3 months (babysitter) beaten
Audrey Marie Hilley 1 several neighborhood child poison
Wanda Holloway 0 1(?) cheerleader(s?) contract killing
Karla Holmolka 1 ? baby sister drugged, sexually assaulted, choked on vomit
Deidre Hunt 1 teenager tortured, shot
Helene Jegado several household servant poison
Genene Jones 11 (46) Pediatric Nurse injection
Lois Jurgens 1 adopted son beaten, tortured
Penelope Kenney 1
Dorothy Jean Livingston 1 foster-daughter kicked down staircase (repeatedly)
Eddiesenior Jones McLaughlin 1 adopted son beaten, burned
Sarah Makin 7+ baby farm stabbed with knitting needles
Beth Ann Markman 1 teenager choked
Evelyn Kay Miller 1 foster son shaken baby
Angela Hope Miller 1 nephew shaken baby
Alice Mitchell (37) nurse starvation, neglect
Marie Moore ? ? coven ?
Patricia Moore 3 babysitter stranged, suffocated
Louisa Northcott ? ? serial sex slayings ?
Hannah Ocuish 1 playmate beaten, choked
Julia Ann Olivas 1 exorcism beaten
Sandra Pankow 3 babysitter smothered
Martha Place 1 stepdaughter acid in face, smothered
Renee Polreis 1 adopted son beaten
Lisa Price 1 foster daughter beaten
Latasha Pulliam 1 neighbor's daughter age 6 tortured, strangled
Martha Rendell 3 1 stepchildren hydrochloric acid
Patricia Rorrer 1 boyfriend's baby shot, suffocated
Amelia Sach dozens ? baby farm poison
Lydia Sherman 2 ? 3 husbands, 5 children, 2 stepchildren poison
Sarah Simpson 1
Brenda Spencer 2 9 principal, janitor, school kids shot
Debra Sue Tuggle 1 fiancee's child drowned
Lise Jane Turner 1 2 (6) babysitting smothered
Louise Vermilyea 1 stepchild poison
Mary Wallis 1 servant
Annie Walters dozens ? baby farm poison
Jeanne Weber 7+ many 2 nieces, 2 nephews, 3 neighbor's kids (babysitter) strangled
Rosemary West 1 (?) stepdaughter
Roselere Wilkenson 1 stepdaughter beaten
Rosa Wilkerson 1 granddaughter poisoned, smothered
Jacqueline Annette Williams 3 adult female 28, girl 10, boy 7 shot, stabbed
Martha Woods 4 2 babysitter suffocation
Dora Wright 1 stepdaughter
Caroline Young 2 grandson 6, granddaughter 4 stabbed
Lila Gladys Young (100+) baby farm neglect, starvation
Anna Zwanziger ? ? rivals, employers and their families poison