If it definitely is heel fat pad syndrome then you could consider switching to forefoot or midfoot striking. This has to be gradual. But if it is PF then forefooting might add more strain. There is also a risk that it switches the site of injury from one to another. But if you already have the injury it could be worth considering, especially if the alternative is to stop running.
FYI I've gradually switched to forefoot over a year or two, so it can be done. Initially, even a k trashed my calves. Now I can run a whole marathon forefoot. I don't claim it is more efficient - just a different mix of pluses and minuses.
First, of all, note that the third paragraph says tendinosis, not tendonitis. There is a difference. You might like to take this into account when googling for typical treatment. Secondly, if you are paying her to advise you, I would follow the advice. Alternatively, you could tell me her hourly rate and I could pretend to be a doctor for a very competitive rate.
A quick google reveals one or two hits for ankle chafing, if this is what you mean. eg http://sub3hrs.blogspot.no/2014/01/migrating-from-kayanos-to-mizuno-wave.html You need to check the shop's policy for taking back the shoe before you put wear on it. You need to make your own judgment on whether it is a chafing issue. As for price, I'd pay any reasonable amount for a pair that works, rather than save money and have a pair that doesn't work properly for me.