A mum accused of sexually assaulting her eight-year-old daughter before attempting to prostitute her online.

Authorities say the 44-year-old offered the girl for lewd acts online to a man over social messaging apps MeetMe and KIK, on December 19 last year.

The man went straight to police in Wayne, and officers from Longview then spoke to Kelly undercover using his account.

According to authorities, Kelly admitted abusing other children in the past and possessing child pornography, and agreed to meet up with the man she thought she was still speaking to for sex with her and her daughter.

According reports she did not show up on December 28 but did continue communicating with the undercover officer.

Carrie Songer Kelly from Texas, US, allegedly recorded two videos of herself engaging in sex acts with the young girl on her mobile phone.