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For the record, there are alreayd continuations to the story and explain Zagara's relationship with the other 2 races. You can fine a glimpse on that on Zagaras wikia article:

Motions for PeaceEdit

After Amon's defeat, Kerrigan granted Zagara two gifts. One was the ability for the Swarm to choose its own destiny beyond the mindless bloodshed. The other was the location of a sentience race that could house the xel'naga's essence. Zagara ordered what essence she could find salvaged from Ulnar, but there was a limited amount. She put Abathur to work on creating a new breed, combining zerg and xel'naga essence to create the adostra. These creatures, though dormant in sacs, could facilitate the rapid growth of life on worlds.

Zagara, now styling herself as Overqueen, tested the adostra on the planet of Gystt, a planet purified by the Protoss Empire in the Great War. She disabled the two protoss satellites in orbit, and landed her forces on the world. The revitalization effort was a success, and the once desolate planet regrew into a jungle world. This however drew the attention of the Daelaam under Hierarch Artanis, who sent a warfleet prepared to purify the world of Zagara's zerg.

However, Zagara was hoping for this. She sent a queen named Mukav aboard a leviathan to Korhal, asking Emperor Valerian Mengsk for aid. Though he was suspicious, Valerian sent a portion of his fleet to accompany him. When the two fleets arrived, Zagara greeted them, and stated that her purposes were genuine in regrowing destroyed worlds. She thought that the same process could be used to help the two faction's ailing reconstruction efforts, and offered to meet them on the surface. The two agreed, so long as they could send a survey team to investigate the planet.

Zagara met with Valerian and Artanis, outlining how she could use the essence of the xel'naga to help the problems of the two races. However, the meeting was interrupted when the survey team was attacked by zerg on the planet. Zagara attributed it to a break line in the control of local broodmothers, and said it would not happen again. However, later it was revealed the research team was ambushed again by an unknown breed named the chitha, and destroyed a nest of adostra thinking they were connected.

Infuriated, Zagara began to take an aggressive stance, threatening Valerian and Artanis. She explained the adostra's history, and that they were the ones who rename the planet. Abathur denied the existence of anything similar to the chitha, and stated that they probably wished to destroy the adostra. Artanis stormed out, but Valerian refused to leave, discussing matters with Zagara further. After the second of three nests were destroyed by the protoss, Zagara and Valerian went separate ways, with Zagara saying she hoped Valerian got to the bottom of the situation

The conflict between the chitha controlled broods and the Dominion and Daelaam forces became known as the One-Day War, and was fought near the nests of the adostra. Zagara recovered the body of a chitha, and had it sent to the Hyperion via devourer. After the third and final nest was secured, Zagara herself came to the nest, using her skyrlings to clear out the smoke from the battle and allowing the survey team to evacuate their wounded.

The Dominion asked to continue negotiations aboard the Hyperion, and Zagara obliged. The survey team had figured out that Abathur was behind the chitha and hiding on her leviathan, and brought a transmitter with them. When they entered the levithian, they found Abathur and Mukav inside. Abathur thought Zagara's creation of the adostra was an abomination, as the zerg essence should always be dominate, and that her motions for peace were a betrayal of the ideals of the Zerg Swarm. Enraged, a fight broke out, and thanks to the pyrokinesis of the survey team's ghost Tanya Caulfield, the chitha were defeated, Mukavw as killed and Zagara tore into Abathur, ripping him apart. He left the evolution master alive, however, and carried him off.

With the One-Day War over, Zagara turned to peace talked with the Dominion and Daelaam, hoping to find a use for the adostra to rebuild the sector.^[5]