I need help with weight loss, but there is a catch

So my mum want's to drop 4 stone before we go on holiday in June and she has this foot problem resulting in her having metal plates in her ankle, if anybody has any advice on this that would be excellent thanks.

Have her go on a diet

When you add it to your morning routine as a tasty juice, it helps FIRE UP an incredible amount of clogged fat inside your body and release it as energy.
People are losing from 28 lbs to 62 lbs on average…
It’s up to 276% more effective than most diet and exercise plans…
And it has a whopping 93% success rate.
I’ll show you all the scientific evidence behind this strange fat-burning “purple weed”...
And how you, too, can take advantage of it right here: https://bit.ly/3GuQVtv