In response to the DVT. While not a contraindication it is always advisable to check with the patients physician to ensure it is appropriate to needle.
It sounds like a typical nerve referral in the saphenous nerve distribution into the medial foot. Intense obviously, was this her first time needling? It good to hear there was a positive lasting effect.
As far as vericosities if the veins have an abnormal appearance I would choose to go proximal or distal to that area to avoid needling the structure itself.
Let me know if that helps and any follow ups.