Maybe I've missed something in the previous posts, but it sounds like her pain levels are fairly minimal.
I've some quesitons:
1. Does the clicking sensation cause pain laterally, and does it occur 100% of the time when she does a heel raise?
2. Other than the clicking and the 1/10 pain, are there any other symptoms?

I would suppose that subluxing peroneal tendons are a possiblity.

From what I'm reading, her symptoms sound pretty mild. Does this seem to be due to the fact that she's dancing minimally, or have the symptoms been 1/10 for quite a while.

I suppopse her pain could be due to a non-union, but if that's the case, the clicking and the non-union may be totally unrelated.