Did you ask her? It's entirely possible the chest and back pain have different causes
Just do a few miles and see how it goes. Make sure you do stretches etc
How was she to know if you'd had two weeks off if you hadn't told her at that point?!
You were concerned enough to ask for help and to see the Dr
That said, I've got a dodgy leg and have just been to the gym and am waiting to see the specialist...to be fair I have seen a physio who referred me (and didn't tell me to rest completely
)
I will postpone my potential 100 miler however until I have a diagnosis!!