Barrister Harry Laidlaw, prosecuting, told the judge that Lancashire had been arrested in September.
Laidlaw said her offences were revealed after a man she was in contact with online was arrested.
He said she had distributed category A images – the most serious category – four times.
One featured a child who appeared to be aged under two being sexually abused.
She had been in contact with people who used usernames including “Mr Bad” and “Pervert”, the judge was told.
Laidlaw said Lancashire had been in possession of more than 150 images – 113 of which were category A.
He said she had, in messages, claimed to have abused children in her care – but had not been charged with any offences relating to children in her care.
Laidlaw said Lancashire had been given safeguarding training and told the judge: “She was more aware than the normal person of abuse – she was more aware of safeguarding.”