U'r assuming a very wild thing here. No not even staff should be immune.
Let me clarify this: No-one is immune to getting booted. This is a server side thing.
U boot someone: API IMVU Receives call, performs database operation on your account and the room ban entry (temporarily if it's a boot), sends a message to the pubsub which then goes into ur websocket connection, saying u've been evicted from the room. That's the process a boot goes thru.
Now I don't see how she is immune. She couldn't even resubscribe to an IMQ Queue if she wanted to. She cannot do whatever she wants.
Nobody on IMVU is absolute. There might be loopholes here and there, but believe me I looked left and right, and the booting regulation is solid.
But do you have any idea what u have to go through the modifications u have to make alone to make IMVU do this even if u had ways of doing it. Because, every precoded client using API IMVU next wouldn't allow this.
Next time this happens, fetch an API endpoint to see if she is actually still there. A client might suffer from a bug, doesn't mean it's server sided or that she is immune. Or IMVU Client isn't sending the request or something internally in client goes wrong. I bet u if I boot her from IMVU's api she a goner the second I run that request.