So across different media we've seen Cynthia Reynolds (whose code name was unfortunately a slur) be given different powers in different media.
The comics - the original version of Cynthia had the power to project mental illusions and make her self invisible to the mind's eye.
Justice League: Crisis on Two Earths animated movie - An evil version of Cynthia appears and has the power to turn intangible. This isn't the "main earth" Cynthia but since the other characters from the Crime Syndicate Earth are meant to be duplicates of their other selves it might mean the good Cynthia that exists in this movie's universe also has intangibility as her power.
CW's The Flash - This version of Cynthia has the same powers as Cisco Ramon, being able to control vibrations and open portals to other dimensions.
So which power for Cynthia do you like the best?