The loss sends Western (38-17) into an elimination game at 3:30pm Saturday against Southern Arkansas.
Bishop didn't allow more than one run in four appearances last weekend in the MIAA Tournament, but was on the hook for eight earned Friday moving her record to 25-9.
The Griffons trailed 4-3 in the fifth when senior Taylor Anding came up with her only hit of the game to drive in the game-tying run. Kat Steponovich followed one batter later with a three-run homer to give Western a 7-4 lead.
After a quiet fifth for the Vikings, they knotted the game on a three-run home run from Lindsay Spanton in the sixth.
And with two down in the bottom of the seventh, Sarah Kennedy ended it with a solo blast to center. It was Kennedy's second home run off Bishop this season. She also connected for one in their first meeting on February 23rd in St. Cloud, Minn.
Sydney Washington was Missouri Western's leading hitter going 2-4 at the plate. Tiffany Gillaspy went 1-2 to improve her team-high batting average to .383.