In "The Westing Game," why does Angela think, "Turtle's crutch is her braid"?Chapters 9-12 is where the answer should be

In a passage near the end of Chapter 12, Turtle says that
Sydelle Pulaski only uses her crutch as a means of getting attention.  Angela says she
believes that Turtle means that it is Sydelle's way of hiding who she really is because
she, like other people, is afraid of revealing that.  Sydelle thinks Turtle's crutch is
her "big mouth" but Angela thinks it is her braid.

We are
not told exactly what she means, so we have to figure it out ourselves.  We have to try
to determine what it is about herself that Turtle wants to hide.  I believe it is that
she is jealous of her sister.  Their mother gives all her attention and affection to
Angela because she is beautiful.  I believe that Turtle's braid is meant to be
unattractive and unfeminine because she feels that she cannot compete with her sister's
looks.  Because she is worried about it, she reacts by making like she doesn't care
about how she looks.  This is why she always wears the braid.