I googled this because it seemed interesting.
The first two articles I looked up emphasize how little influence she had on anti-trust cases. At her hearing she said "Antitrust … is not my strong suit." It seems like she went along with other more experienced judges in this area such as Scalia or Breyer who is noted for being very business-friendly.
Where is your idea that Ginsburg was the lynchpin for weak anti-trust rulings coming from?