I never really thought she had a "condition".
I didn't realise it was an act, but it seemed she was like most people: out going or quieter depending on the mood she was in. Everybody needs time to themselves. Wearing the jester outfit coincided with times she was likely to be extroverted anyways.
As to her suddenly being shy when voulger torn the outfit off, wouldn't you be a bit scared and quiet suddenly when you realised you couldn't do much to stop someone from hurting you?
I know I myself seem rather quiet and introverted to most, until I'm with friends I'm feeling relaxed with or up on a stage. My guess is that Maytag simply chooses, like me, whether she feels like being shy or not. The difference is that she made it out to be a condition, something she had no control over, and that never seemed likely to me.