WEST YORKSHIRE POLICE
Speaking after the case, a relative said the girl had been left “serving a life sentence”.
Sheldrake should be “behind bars for the rest of her life”, they added.
The 41-year-old was jailed after admitting two charges of taking indecent photographs of a child.
She also admitted two charges of making indecent photographs of a young boy.
And she admitted one charge of inciting a girl aged under 16 to engage in sexual activity and one charge of engaging in sexual activity in the presence of a girl under 16.
Sheldrake, of Beeston, Leeds, West Yorks, admitted possessing 2,578 indecent images and 110 videos of children on a mobile phone.
She also admitted distributing indecent photographs of a child and attempting to pervert the course of justice by encouraging a child to provide false information to police.
Catherine Silverton, mitigating at Leeds Crown Court, said Sheldrake had no previous convictions and was ashamed of her offending.
She said: “Nobody hates her as much as herself.
“She described herself as a monster.”
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Miss Silverton said the case had been going on for almost three years.
Jailing Sheldrake, Judge Sally Cahill QC, told her: “It is said on your behalf that you have shown remorse.
“I have to say that – having read reports and reviewed the evidence – there is no real evidence of that in relation to your victims.
“You have realised the consequences of your behaviour and the consequences are severe.
“In my view you have not shown any real remorse.”
Detective Inspector Marc Bowes, of West Yorkshire Police, described the offences as “absolutely appalling” and described Sheldrake’s offending as “significant and sustained”.