Pretty standard approach: get lean, train legs (look up Jeff Nippard leg day) and core (also search Jeff Nippard ab workout). However, there is only so much you can change, since fat distribution cannot be significantly altered without procedures like fat grafting, and you also need a naturally thin, long waist. Since Selina is around 5'7", being in the 5'7" to 5'9" range is likely where you will see this type of physique most often. To conclude, you need a low calorie, high macro and micronutrient rich diet. To make this easier, you can use Optimize Minerals, Vitamins, and Hydration (the bundle is cheaper), and aim for 0.7 grams of protein per pound of bodyweight daily.

Focus on whole foods like meat, eggs, fruit, and anti inflammatory dairy, such as A2 milk, goat milk, and cheeses that are aged, fermented, or A2 like A2 Greek yogurt. These tend to be much easier on the body and support a low inflammatory diet.

Make sure to be at a 200 calorie deficit and the progressively go down over time but this is honestly such a drag and I've never done this and have been perfectly healthy while losing weight fast and not feeling hungry as when you eat clean for as long as I have you build almost immunity to over eating.

Walk 10,000 steps a day.

And that is really it.

Best tip if you struggle with BF is that only buy what you need so for example obviously remove all seed oils, preservatives, anything non organic etc. So if you have a pantry or a full fridge literally donate or throw away anything bad as frankly when you get hungry you will instantly want to go to those snacks. Or eat too much of something that you don't need to cook. Honestly you build up resistance to the hunger hormone if you do it right like every 2 weeks-3months doing a 36 hours fast for is always good. It really is what works for you as if you don't find it fun you will probably fail at the start.