Pearson hit the line at 12:67 seconds to cross just ahead of England's Tiffany Porter (12:80) and Canadian Angela Whyte (13:02).
It has been a tough week for the Olympic champion with Hollingsworth sent home to Australia after making derogatory comments about her preparation.
After maintaining her silence throughout the week, Pearson let fly at Hollingsworth, stating that he was a bad influence on the athletics group.
“My case was so less severe than anyone else’s on the team, there are so many stories, I’m not going to name any names, but everyone has copped a lot of crap,” Pearson said.
“I’m so glad that I really didn’t have to lift a finger to get him off the team. I think that is the most important thing, to get rid of the negativity people have been having to bare for the last five years is very disappointing.”
There was two more athletics golds for Australia on day nine with high school student Eleanor Patterson winning the women's high jump and Dani Samuels claimed the women's discus.
Veteran diver Matthew Mitcham had a successful night as he won gold with Dominic Bedggood in the men's 10m synchro after picking up a silver with Grant Nel in the 3m synchro earlier in the evening.
Maddison Keeney let nerves get the better of her as she won silver in the women's 1m springboard - with fellow Aussie Esther Qin grabbing the bronze.
Gymnast Mary-Anne Monckton secured a silver medal in the women's beam while the Hockeyroos progressed to the final with a 7-1 smashing of South Africa.
In other Commonwealth Games news, Usain Bolt delivered on his only Glasgow performance as he guided Jamaica into the 4x100 metre relay final.
The Jamaican, who chose not to compete in the 100m or 200m at the Games, ran the anchor leg to help his country win their heat in a time of 38.99 seconds.
It was an unconvincing performance from Jamaica in the first three legs, but Bolt - a six-time Olympic gold medallist and world record holder in the 100m and 200m - surged clear in typical fashion on the final leg to delight the crowd at Hampden Park in Glasgow.
"Salute Kimmari Roach despite being injured completed his leg..Good run by [Julian] Forte and [Nickel] Ashmeade to get the Baton around," Bolt tweeted afterwards.
Edith Sum and Jonathan Ndiku added to Kenya's medal tally with victories in the women's 800m and men's 3000m steeplechase, and Uganda's first gold of the Games finally arrived as Moses Kipsiro emerged triumphant in the 10,000m.
Steve Lewis of England, winner of bronze in 2006 and silver in 2010, made it gold at the third of time of asking in the men's pole vault.
Elsewhere, Jack Laugher claimed his second diving gold medal of the Games with success in the 3m synchronised final with Chris Mears.
The victory rounds off a brilliant Games for 19-year-old Laugher, who has also won gold in the 1m springboard and a silver in the 3m springboard.
More medals came for Canada at the SSE Hydro gymnastics venue, Scott Morgan and Elisabeth Black sealing gold in the men's vault and women's beam respectively.
Scotland's Daniel Purvis gave the home nation yet another reason to celebrate with triumph in the parallel bars, and there was glory for England with Claudia Fragapane in the women's floor and Nile Wilson in the men's horizontal bar.
Nicola Adams – the first woman to win an Olympic boxing medal – has a chance to add another title to her personal tally after she secured a place in the final of the women's flyweight event by overcoming Canada's Mandy Bujold.
The Scotstoun Table Tennis arena saw a clean sweep for Singapore in the women's singles, won by Feng Tianwei.
Further success for Singapore came with gold and bronze in the men's doubles.
Scotland dominated the final day of competition in the lawn bowls, their men's fours team beating England in the gold medal match, while Darren Burnett won the singles event.
Gold in the women's pairs went to South Africa with a 20-17 win over England.