Shirley and Wanda are little same. They are foreigners, and they all do not have any friends in the U.S.at first, so they are shy in the U.S. at first, too. But they still have something different.
Wanda is shy all the time, so she didn't make any friends in the U.S. She can speak English, so she does not have any friends just because she is shy and other people make fun of her funny Polish name.
But Shirley is Different. She was shy at first just because she can not speak English. If she can speak English well, she can make lots of friends in American. She has a little pride.
So I think Shirley and Wanda have something same, but their character are still different.