If the pain is neural in origin you might look for the restriction more peripherally, in the popliteal region where thing branch in to tibial and peroneal nerves. Also the common peroneal nerve exit at the distal third of the tibia etc. If she also had knee pain and the heal pain arose following that I should think it is worth investigating this area.

Note on LLTT's the difference between adding in dorsiflexion before SLR and adding it in pre SLR. This might give a clearer direction as to where any possible restriction might be.

I would never forget to also mobilize the head of the fibular as a possible source and remedy to referred knee pain and other symptoms that don't quite add up 8o