She went back to that current time line so nothing really changed. She stopped Ezra from doing that and went back.The existence of Ashoka in this time period kinda allows for any Jedi from the past or future to show up right
Correct me if I'm wrong but Ezra pulled her out of the past right before Vader kills her in that Jedi time machine at one of the temples correct?
Why couldn't it happen again when Mandy and the Kid show up at the Jedi temple and someone else gets pulled into this time line, of course it would be cheesy but Filoni did introduce it in Rebels
The path they used to open that portal was a very specific place and it was more associated with the Sith if I remember correctly. Grogu and Ezra combined ain’t got the chips to unlock anything at this point.