Barry and Cisco were reeling from the news that Iris and Kamilla were replaced by doubles, and they have no idea that Iris and Kamilla are working to free themselves from the other side of the Mirrorverse.
With only one episode left in Season 6, I say Iris needs to stay where she is.
The A plot of “Pay the Piper” pitted the good guys of Earth Prime against Godspeed with a reluctant assist from Pied Piper, but the real meat of The Flash on May 5 concerned Iris and Co. stuck in the Mirrorverse.