Angeline Feazelle, 30, was convicted of abusing the child, who lived with Feazelle and her boyfriend, Jeremy Cochran, in Jarrettsville at the time the abuse took place.
The victim revealed the abuse in 2008 and was immediately removed from the home.
Feazelle and Cochran were charged with abuse and conspiracy to commit child abuse last year after the girl was able to provide additional details to police.
Feazelle was convicted in January and has now been sentenced to the maximum term of 80 years. Following her release she will also have to register as a sex offender.
The State asked the court to impose the maximum sentence for each count due to the horrific nature of the abuse.
Cochran was also convicted and sentenced in early March to serve 80 years in prison.