Paetongtarn was suspended from office last month after being accused of failing to stand up for Thailand in a June call with powerful former Cambodian leader Hun Sen.
Thailand accuses Cambodia of planting new land mines despite a ceasefire that President Trump helped broker to end border clashes. Cambodia denies this.
Thailand and Cambodia should urgently resolve their simmering border conflict to minimize hit to businesses and tourism, according to Minor International Pcl, one of Asia's largest hospitality groups.
Thailand's suspended Prime Minister Paetongtarn Shinawatra has testified in a Bangkok court on her alleged breach of a law on ethics in her handling of a border dispute with Cambodia, a case that could see her forced out of her job entirely.