When is it time to say goodbye?

My relationship with my hair stylist began about 6 years ago.  She's good, her salon is close to my house, and I will forever thank her for talking me into short hair.  It was a big step for me, and for about 5 years I have enjoyed many variations of my short bob. 

But here's the problem:  I'm growing tired of it.  I want something new.  But alas, beloved hair stylist apparently wants nothing to do with putting me in shoulder/mid-length hair.  Despite expressing my desire that I would like to grow my hair out, our session ended yesterday with her taking a razor to the back of my neck and telling me that I'm a "short-hair gal".  Perhaps I am. But I'm itching for a change, and after 9 months of almost getting through the ugly transition period only to have her chop the whole thing off (this has happened at least twice), I'm beginning to doubt that I will ever get my shoulder length hair back. 

So my dilemma:  Do I throw caution to the wind, say a pleasant goodbye, and find someone else who may or may not be as good?  Or do I put my faith in my trusty hairstylist to know what looks best for my face and hair type and possibly live with the short bob for another 10 years?  Comments?