This is a sad scenario with the patient going through multiple AVF failure. In such a situation, trying to get a functional access in the upper extremity needs to be pursued before embarking on the lower extremity access creation. Few of the upper extremity options will be to try to establish a brachial artery to brachial vein AV fistula followed by staged superficialization/transposition if the patient has adequate size brachial veins. If grafts are available, AV graft or a Hero Graft in the arm should be a viable option.
Obviously, a functioning lower extremity AV fistula can be created if there are no available upper extremity venous or graft options. The Post. Tibial or Dorsalis Pedis to Saphenous Vein AV fistula can be done or the Saphenous vein can be harvested to create a proximal thigh Femoral Artery to Femoral Vein loop AV access. It is important that the patient does not have incompetent lower extremity venous valves/varicose veins for the AV fistula to function adequately without causing lower extremity dependent venous hypertension, edema and thrombosis.
I hope this patient does not have any thrombophilia syndrome, which needs to be excluded or appropriately treated before the creation of the lower extremity AVF.

Previously, I have seen patients with fully functioning long-term lower extremity AVF while working in the university setting.

I performed in the far past, leg fistulas with the saphenous vein. It is not worth because the veien don not really mature.
The best is the transposition of the femoral vein, with no need of a first stage like with basilic vein on the upper limb. The vein is at least 7 to 8 mm and this allows a safe one stage surgery. However, the size of the anastomosis is the big concern, if we want to avoid a distal ischemia. The lenght do not exceed 5 mm on the lower part of the femoral artery.
However, I am not sure this woman is a candidate for such a technic wich is for patients with no possibility at the upper limbs.
There are lot of technics like the 2 or even 3 stages transposition of brachial vein!
When a fistula is thrombosing, it is mandatory to know the reason. Otherwise, you are in the fog! If there is a thrombophilia, it is necessary to operate the patient with coumadine and an INR around 2,5. The most challenging cases for me are patients with thickening in some weeks of all the veins anastomosed to an artery.

If mapping does not show an adequate upper arm vein the I would go with an upper arm graft. If an underlying coagulopathy or infection risk is possible then I suggest bovine rather than PTFE. I would continue to purse PD.

Pursue PD.