Adimle Puplampu, aged 24, doctored each branch's betting ledger and altered details of wagers to steal thousands of pounds from her employer.
Northampton Crown Court heard she was suspected of stealing more but could only be prosecuted for what CC
TV cameras in the various shops had been able to capture.
Puplampu, formerly of Thomas Chapman Grove, Southbridge, Northampton, pleaded guilty to 12 offences of theft and false accounting, committed in July and August last year.
William Falshaw, prosecuting, said she inflated bets by recording them in the ledger as higher than they were, would pay out if they won and then pocket the money.
Puplampu, now of Erdington in Birmingham also made up false bets as well as overinflating the stakes placed with Ladbrokes, sometimes paying herself on losing bets.
Over a two-month period, she stole £6,038, having asked for 22 similar offences to be taken into consideration, which happened while she worked at Ladbrokes outlets in Kingsley Park Terrace, Adnitt Road in Abington, Gold Street and Market Square and Park Square in Kings Heath, Northampton.
Mr Falshaw added: "Ladbrokes detected irregularities and began to focus attention on the defendant. CCTV showed she was the only person at the counter when the payments were made."
Basil Lloyd-Morris, defending, said Puplampu could not remember any of the thefts or making false entries into the betting ledger because she is bipolar.
However, Judge Richard Bray said: "The truth of the matter is your client was able to do her job at Ladbrokes and was able to commit quite a sophisticated fraud.
"The fraud required intelligence, working with her brain, memory and indeed greater skills than doing her proper job in paying out on betting slips.
"She faces a custodial sentence but I will adjourn for a pre-sentence report."
The judge released Puplampu on conditional bail until her sentencing later this month.
