Police sources revealed at the time that there was a seven-hour stand-off as negotiators talked her out of her threat to shoot anyone who tried to enter the house.
It later emerged the gun belonged to Pieterse and was one of several items allegedly stolen 48 hours earlier from a house where he was living.
Pelser was subsequently charged with firearms offences and with breaking into Pieterse's house.
Meanwhile, Budd remained concerned about her safety.
In her court statement she said she was worried that Pelser could endanger her and her children - Lisa, ten, and twins Michael and Avelle, seven.
Budd said her husband had given Pelser notice to vacate the house he had made available to her by Monday.
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The South African-born runner - who was granted a UK passport to run for Britain in the 1984 Olympics - told a judge in Bloemfontein she feared for the safety of herself and her three children.
Budd, 39, told the court that her estranged husband's former lover, Agatha "Pinkie" Pelser, had phoned her at 2am and threatened her: "This is a fight to the death." The love triangle involving the former 3 000m athlete, her husband Mike Pieterse and Pelser was revealed when Budd told why she wanted an order keeping Pelser away from her.
Telling the court she could not ignore Pelser's "emotional instability" any longer, she outlined a series of events that occurred after her husband ended his affair with Pelser.
He told his lover to move out of a house she was renting from him, but from then on, Budd told the court, she became increasingly worried about the other woman's behaviour.
According to a statement Budd gave the court, police were called to Pelser's rented house on July 1 after being told she had a gun and intended killing herself.