Yep Diane can live and sing again and these kinds of breaks are no problem for a proper shop that's jigged-up to handle the positioning and clamping on the different axis. The repair should be stronger than the original neck but probably not a good idea to send her flying in the future but you know that...
We don't accept work sent in to us unless it's one of our famous clients who we do support for their entire fleet. But lots of Luthiers can handle headstock breaks and some of them even use the jig that Dave Collins, my business partner invented.
If we were to do it the cost would be $160 to give you some range of possibilities, prices all over the country vary a great deal FYI but she can be fixed so relax.
PS I have a guitar just like Diane only mine's black
and they are great guitars and the pups are smoking hot too. PRS Se's are IMHO one of the best values out there, very high quality Korean build, great designs, excellent electronics. My only criticism is that as an import the body woods tend to not be the usual big 3 and sustain can be a bit lacking on some of them depending on the materials.When completed the repair should be invisible.