Coke-dealing Sydney socialite forced to fight in jail cell

Drug-dealing Sydney socialite Lisa Stockbridge has cried in court while recounting the difficulties of life in custody, saying "there's no fresh produce".

Stockbridge was speaking at the Sydney District Court ahead of her sentencing on Thursday, adding that she had been forced to fight when an aggressor came into her cell.

The lifestyle blogger has pleaded guilty to two charges relating to dealing cocaine and ecstasy to "friends and friends of friends".

Stockbridge said processed foods gave her rashes, caused her hair to fall out and caused menstrual and other medical problems.

"It's all processed food (in custody) apart from fruit," Stockbridge said.

The court heard her cell mate told others in custody that Stockbridge, who was a prisons officer for a year in 1994, was an undercover cop.

"It was really difficult transitioning to that world," she said.

"I didn't look like them, I didn't talk like them, I didn't act like them."

Custody, she said, was a dangerous place where she "was forced" to fight.

"I just came out on top. Just," the 43-year-old said.

Stockbridge began dealing drugs in 2012, generally making $200 from selling two grams of cocaine and selling about 50-100 grams a week.

She bought ecstasy pills for $12 a tablet and sold them for $25 to $30, depending on how many were purchased.

The court heard she began selling drugs to pay back a $100,000 loan taken out to keep her business solvent.

"I had to find a means," she said.

The hearing continues.