Switching everything

Jon/Helen unlocked the door and walked out, wondering what it was like to go around as Elasti-Girl. She walked past her mother. Who screamed. "W-- who are you?!" she said. "And why are you dressed in a movie costume? Help! Jon!" She ran out, screaming about an intruder. Argh. Now that he was back as Jon and just changed to Elasti-Girl, everyone now remembered Jon again. But that was easily fixed. "I wish that whenever I change to Elasti-Girl, people will remember me as a girl, and when I change to Jon, people will remember me as Jon again, except for people like Karyn who I want to know that I've changed. I wish that that will happen even if I change right in front of them." Which seemed okay. There was just one more thing to do... the secret ID. If Jon said she was Helen and appeared as Elasti-Girl, anyone who saw the movie would immediately know who it was. What could she do to fix this?