Sally Bercow, wife of Commons Speaker John Bercow, could be in trouble with the law after reportedly breaching a court order by naming a teenager from East Sussex who allegedly ran away with a teacher.

Mrs Bercow, already on a list of those who wrongly named or linked former senior Tory Lord McAlpine with child abuse claims, sent a message on Sunday night to her 59,000-plus followers on Twitter asking what happened to the teacher, Jeremy Forrest, 30, and reportedly named the girl.

The tweet was later deleted after Mrs Bercow was apparently warned about the order by journalists – though another message remained: "Forgive random question – just discussing with friend...".

Forrest was arrested in Bordeaux in September. He was returned to Britain and charged with child abduction.

In the initial stages of dealing with his case, the court made a Section 39 Order under the Children and Young Persons Act 1933, banning identification of the girl.

On Sunday she also tweeted that she was "a bit scared to comment on trending topics nowadays". And she also told her followers that she does "not have the money to contest a multi-millionaire".

Sussex Police said: "Sussex Police is fully aware of reporting restrictions around the case involving Jeremy Forrest and, therefore, is being cautious in the information we release. We will actively investigate potential criminal breaches of these restrictions by others."