"Maybe her house was foreclosure, maybe she needs money to put food on the table, maybe she's greedy," Mahrokh Rastegar said.
Whatever her motivation, cops say her M.O. remained the same.
On Friday morning, police say she walked into a Community National Bank on Merrick road in Rockville Center, produced a note claiming she had a gun, and walked out with cash.
"It's not unusual for somebody to hit a series of banks and she's likely to continue doing so until she gets caught," said Nassau County Police Det. Sgt. Anthony Repalone.
She wasn't finished.
The very next morning she showed at the same spot, and hit the Astoria Federal Bank right next door.
An hour after that, she was on the north shore turning up on Middle Neck Road in Great Neck, where she targeted another Community National Bank.
"What we see when we deal with these serial bank robbers is that usually they have some sort of underlying vice, whether it be heroin or narcotic addition or gambling, but they're desperate. And they're also dangerous," Repalone said.
She was caught on camera, but police say it's likely the she was disguising herself with a wig and dark glasses.
No one heard her voice, and she was wearing gloves.
They don't know if she actually was carrying a gun, or simply indicated that she was.
To Bibi Rosin, it doesn't much matter.
"I just heard sirens, I thought there was a fire somewhere," Rosin said.
She works in the real estate office right next door to the Great Neck branch, and was in the office at the time of the robbery.
She hopes cops can catch the serial robber before she strikes again.
"That's strange. We'll lock our doors because we sit, girls alone and it's scary.
The suspect is described as a black female, early to mid 30's, 5'7"-5'8", 180 lbs., dark complexion, thick build, shoulder length curly, dark brown hair with blonde highlights, and wearing large dark sunglasses.