I don't know where I can ask a question.

If this place is not appropriate I'm sorry

It came from the movie 'freaky friday'
Let me show you the lines.
Anna: I know your life is perfect. Your perfect job, perfect patients who worship the ground you  walk on.
Mom: Honey, you need a serious and bracing reality check if you think my life is perfect.

In the last line, what does bracing mean?