Steel captain Te Huinga Selby-Rickit described the game as nerve-wracking but said she was "stoked that we got it in the end".
"That's what we want to be able to do, to win those really tight games."
The Stars were without veteran players Temepara Bailey and Ellen Halpenny, who were given pre-approved leave, resulting in the hosts fielding an inexperienced attacking end. That often left them attempting risky and ambitious feeds which did not always pay off.
However, they still built a handy buffer after a scrappy first half in which all shooters were having trouble finding the ring. The Stars, with young goal attack Charlee Hodges assigned the long-range duties and Maia Wilson operating from close range, shot 78.9 per cent in the first two quarters with the Steel struggling at 70.3 per cent until Potgieter's arrival changed the match and gave the Steel the ascendancy.
The Stars had a chance to even up the game in the last stages of the final quarter, getting within one goal with two minutes left, but the Steel managed to keep their cool and finish strongly.
It was the third straight loss for Stars, but they did receive a bonus point which widens the divide between the top and bottom teams on the 2019 ladder.
The Steel remain second on the ladder with 20 points, while the unbeaten Central Pulse hold top spot with 24. The Stars have 16 points, which is still a decent gap ahead of the fourth-placed Waikato-Bay of Plenty Magic on nine.