I'll betcha if she catches the Doctor snuggling up to another TARDIS, she'll see Red
And, she doesn't have a defective Chameleon Circuit, she's just partial to the Blue Police Box look. (She did have a defective Chameleon Circuit when 6 started messing around with it, trying to force her to change, though).
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?