Wow, what an excellent client presentation. Well done.
You know I sat and thought about this for a few minutes and then thing that stands out like a sore thumb is that the focus of the persons complaint is entirely on the achilles area, the area that is damaged because of to much "attention". I would therefore say that doing anything direct to the tendon itself in the calcaneal region is continuing this focus and although there might be some short lived reduction in pain, the actual approach is nothing but a reactive attempt to reduce pain.
I would suggest that in all tendinosis cases that the biomechanics are at fault. Diet and footware are factors but so is personality. We need to look back to the initial causes and look at the chain of events from the spine down in order to look at the stress on the insertion. Also the foot up is considered and we can see orthotics have given her more time but now aren't enough (another reactive measure).
This is most likely a slow moving degenerative condition with a acute episode lying on top (bursitis etc). I would make a thorough biomechanical assessment, especially on the role of soleus in eccentric dorsiflexion (this is bound to be terrible). Hips, glutes etc would all be looked at. We have had some good previous discussion on soleus control and how the affects to achilles. I'll look up the posts and place them below.
I have now added a few of the discussions to the tag system. Click on TAGS in the main menu and then on achilles to look as summaries of the posts. Then click on each post to have a read and gain some insite into the whole achille area.
Best of luck and thanks again for this informative post.