Adelaide Strikers spinner Amanda-Jade Wellington produced the best bowling display in WBBL history to help lift her side to a crushing eight-wicket victory over the Brisbane Heat in 'The Eliminator'.

Wellington snared an incredible 5-8 from her four overs as the Heat slumped to 7-52 in the 12th over at Adelaide Oval on Wednesday night.

Only a late cameo from Nicola Hancock (40 off 26 balls) and a brave effort from the injured Nadine de Klerk (18 not out off 25 balls) saved the Heat from complete embarrassment as the two-time champions limped to 8-114.

De Klerk was in pain every time she went for a run after being struck on the inside of her left knee while scrambling through for a single early in her innings.

In reply, the Strikers cruised to the victory target with 21 balls to spare.

Katie Mack (50 not out off 42 balls) and Tahlia McGrath (38 not out off 27 balls) combined for an unbeaten 71-run stand to make easy work of the run chase.

The Strikers will now take on the Melbourne Renegades in Adelaide on Thursday in 'The Challenger' for the right to face off against the Perth Scorchers in Saturday's final in Perth.

Wellington, playing her 100th WBBL match and pushing for an international recall, was unplayable at times during her mesmerising spell.

The 24-year-old's first victim was star opener Grace Harris, who charged down the wicket and was subsequently stumped after being outdone by the spin.

Mikayla Hinkley fell two balls later when she edged a sharp-turning delivery to slip, and Jessica Jonassen was bowled by Wellington in the ninth over.

Wellington was on a hat-trick in the 11th over after snaring Laura Kimmince and Georgia Voll in consecutive deliveries.

De Klerk was able to keep out the hat-trick delivery, but it was far from convincing after the ball fizzed sharply to hit the shoulder of her bat.

Just as all hope looked lost for the Heat, Hancock whacked six fours and a six to at least give her team a defendable target.

Wellington's bowling figures beat out the previous WBBL best of 5-15 by Molly Strano while playing for the Renegades at the MCG in 2016.

AAP