The Valyria Empire wrote:The population of Dorne was hardly affected in the War of Conquest. Rhaenys flew down, had a chat with the yellow toad, and went home leaving Dorne unconquered for the time.
If you read your own source you'd see you're wrong.
The Dragon's Wroth
Aegon's grief at the passing of Rhaenys was great; the following two years were known as the Dragon's Wroth. The Targaryens burned every Dornish stronghold at least once, with the exception of Sunspear. In Dorne it was said that the Targaryens feared that Princess Meria had cunning means of slaying dragons purchased from Lys, but Archmaester Timotty in his Conjectures suggests that Aegon hoped that the Dornish would turn against the Martells. However, the Dornish lords and smallfolk remained loyal, despite the letters dispatched from the Dornish Marches to the Dornish houses claiming the Martells had buyed their safety from the dragons.
Aegon and his remaining sister-queen, Visenya, placed bounties on the heads of Dornish lords and in turn the Dornish put bounties on the price of the Targaryens and their allies. Aegon and Visenya were assaulted on the streets of King's Landing and, if not for Visenya and Dark Sister, they would have been killed. This attack led to the forming of the elite royal bodyguard known as the Kingsguard in 10 AC. Visenya personally chose the men herself.[4] Lord Fell was murdered and the Wyl of Wyl committed atrocities, particularly in Fawnton and Old Oak.
Peace
When Princess Meria Martell passed away in 13 AC, her elderly son, Nymor, became ruling Prince of Sunspear. Having enough of war he sent his daughter, Princess Deria Martell, to King's Landing with an escort as an peace envoy. She carried the skull of Rhaenys's dragon Meraxes as well as a letter. The delegation's arrival with the sight of the skull angered several in the court, such as Orys and Visenya. Deria delivered her father's terms, stating Dorne wanted peace, but the peace of two sovereign kingdoms. Aegon was about to refuse this offer until Deria placed her father's letter in the Conqueror's hand.
Atop the Iron Throne, Aegon read a message delivered from a Prince of Dorne. No one knows what was in that letter, as Aegon never spoke of it thereafter. Some say he rose from the throne clutching the letter, blood trickling from his hand. Some maesters and historians speculated that the Dornish held Rhaeneys as an injured hostage and the Dornish would agree to end her suffering if Aegon ended the war. Whatever was in that letter moved the Conqueror to agree to peace terms and withdraw his forces from Dorne.
Hardly affected indeed.