Although Poison Ivy had worked with Schiller before, she knew he was a native of this universe. The greatest opponent she would have to face in the future was still this universe's Batman, and even getting on good terms with people from other universes would not save her from Batman settling accounts afterward.
But getting on good terms with this universe's Batman was difficult. On one hand, nobody knew where he was. On the other, if that hot-tempered Batman learned that her mistake had opened the portal, the chances of him listening to her explanation were slim.
Poison Ivy decided to take another route. Batman cared deeply about the Bat-family, so she would help the Bat-family during this incident. That way, when he settled accounts afterward, she might at least receive a lighter sentence.
It was not that Poison Ivy was so afraid of Batman. The problem was that Batman was using his real name online now; his other identity was President Wayne.
Ask criminals whether they feared Batman, and eight out of ten would say no. Ask whether they feared the richest man alive, and twelve out of ten would immediately insist they were model employees who had never done anything illegal. The president worked the same way.
To ensure she could live normally in the future—and perhaps earn some favor with the president and push through more plant protection laws—Poison Ivy decided to start with the Robins and give them more clues to win over those little brats.
The most important clue Poison Ivy held was related to the portal she had opened, especially now that she knew the portal was merely a decoy. The thing that had truly worked was that hole.
After Poison Ivy told the Robins this, they did not connect it to any dreams.