Leg Swelling with pain. Right treatment?

My mother 52 yr old suffering Leg swelling with pain for past 1 year. She is not able to walk normally. My mother undergone spine surgery last year July'20. During Sep'21 she got extream swelling in the leg. We took test and found DVT is formed. The surgeon who operated spine surgery, invited us to admit in hospital. He put Enoxaparin injection 3 days. Leg swelling reduced completely. He adviced to take Warfarin tablet. We came home but after some days again leg swelling started. This time(Jan 2021)we checked NEUROLOGY doctor Ranganathan Jyothi in chennai. He checked all reports, said DVT will take year to cure so you need to wait. He adviced to take Dabigatran , Neuropill and vitamintablets. Somehow leg swelling reduced, but if she walks, or sit for 10 to 15 minutes leg swelling increasing again and getting extream pain in the pain. She's not able to walk freely. Till now she is getting leg swelling and pain. I am getting fear, whether I am going right treatment? Or not. Pls help me.