I would say it's an infection. But you need to ask the surgeon if she could be alergic to the mesh. I had surgery almost six weeks ago, and mine is still draining. But we're talking two months with her. I don't think its surgical. Maybe stronger antibiotics? Good luck.
Pus draining from any surgical incision is most consistent with infection. Culture of the the drainiage to confirm the presence of bacteria and to 'direct' antibiotic coverage is often appropriate.
When mesh is used in a hernia repair, and the incision is continuously draining pus, despite drainage and antibiotics, repeat surgery with complete mesh removal may be required.