Her kettlebell video is rated as dangerous to do by certified kettlebell instructors, she is not certified to instruct kettlebell technique. Her kettlebell technique instruction is not correct and has a high potential for injury.
Your physician is correct you are eating at a starvation level which will preclude any proper weight loss, anything less than 1200 calories a day is starvation level and that 1200 level is only adequate for a small totally sedentary individual.
I think you need to reassess your programme and use the tools here to help you create one which will help you reach your goals.
It is called WORK-ing out for a reason.
I said getting fit was simple, I did not say it was easy.
Cardio burns calories, strength work burns fat.
Eat well to lose weight, exercise to get fit
You can not build a six pack using twelve packs
Often when we seek a magic bullet for fitness we end up shooting ourselves in the foot.
"I think calories are little germs in food that all moms are afraid of" Dennis the Menace