First do colour doppler and confirm she has thrombosis or not.
Varicose veins are common problem now a day due to unhealthy food habit and lifestyle
She don't need to surgery if she starts proper holistic treatment
First start intac protein zinc and magnesium diet if she have no any kind of kidney related problem
Stop sodium intac (use rock salt or low sodium salt)
Start ginger and omega 3 fatty acid (it's improve her blood circulation and vein health)
Prasaarini oil / apple vinegar for local application
Proper treatment is available in ayurveda and homeopathy medicine system's and physiotherapy is very good supporting treatment for varicoseveins