Should she omit her failed probation?

As recruiters, I would appreciate your insights on a dilemma my partner is facing. She is 32 years old and has spent 3 years in customer service for a well-known fashion brand, followed by an additional 2.5 years in their marketing team. Unfortunately, due to some internal politics and toxic behavior from new hires, she decided to resign. Two months later, she landed a position as a marketing manager in the food and beverage industry, but she recently discovered that she did not pass her probation period.

Should she exclude this experience from her resume? I am concerned that a three-month role with a probation failure might deter potential employers or recruiters right from the start.

I would greatly appreciate any advice you may have! Thank you!