This Hydrangea Needs a Plant Doctor

A friend gave me this Hydrangea and asked me to rescue it.  I have no idea how long she had possession of it.  It looks like it may have been frost bitten, hence the curled leaves.  Do you have a diagnosis and recommended treatment plan?

I just planted my first hydrangea last year, so I don't know much about them.  Any help you can offer would be appreciated!!