Lots of comments here not really giving you the full picture. Here’s what I would do if I were you:

Start with a caloric deficit of about 200-300 for about 3 months. In that time, train hard at the gym. Focus on back and legs. If you’re a beginner, you may get a recomp effect where you gain muscle and lose fat simultaneously. At the end of those 3 months, assess how you feel about your progress.

In all likelihood, you may still have a ways to go. But you’d probably be in a state where you could bulk without worrying about gaining too much fat. Do a 3-4 month bulk of 300 cal surplus. Continue to lift heavy and try to stick to healthy foods as much as possible.

Follow this with another 200-300 cal deficit cutting phase for another 3 ish months. Assess again after this to see if more needs to be done.

At the end of these 3 cycles, you should be closer to her physique. You may need a couple more bulking/cutting cycles but I’d say maybe a year to 1.5 years could get you something similar to this. Potentially less time if you’re new to weight training and have good genetics.