Anxiety Therapy

What would cause a beautiful, successful, confident woman to suddenly have bad anxiety to the point where she has bad panic attacks, fear of crowds and needs to seek a therapist?
@ Bananas

Thanks. But I’m not talking about myself. I’m talking about someone I care about.
We can’t always know what’s happening in other people’s lives that [...]

Does anyone know of any books or videos, or any solutions to help with anxiety attacks, and overall generalized anxiety. I asked this question once before, and it was removed! I really don’t understand why.
Thank you all for all the great information!
Deep breathing helps you to relax a major nerve that runs from the diaphragm [...]