Gwenny: Hello Alexa.
Alexa: Hello Gwenny.
Gwenny: Long time
Alexa: Not Long enough
Gwenny: Sorry you didn't make the basketball team.
Alexa: What? School has not even started.
Gwenny: And now I'm in your head
Alexa: Well, I'm in your head and there is an echo because there is nothing else in here with me.
Gwenny: Cause everything left when you walked in.
Alexa: Maybe I'll redecorated all in here
-Don't you dare.
-too late it's done.
Movie: Alexa and Katie.
What does the bold part mean?