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M@YHEM;
ok by the stats you've given
Age: 25
Weight: ~ 55kg
height: ~ 170cm
her BMR ~ 1378 (never eat below that obviously)
her TDEE is somewhere between 1800 - 2120 depending on which method you believe (based on the activity level you mentioned).
With reverse dieting the idea is to increase kcals and macros (mostly carbs iwth a bit of fats getting upped and keep protein fixed) by a small amount each week, based on progress. Usual increase is about 1% kcal increase per week. I've done that and it's really good. Slow but worth the effort. This is Layne Norton's approach in a broad sense. It's good to track progres every week.
This helps your body to adapt to more calories and is designed to help you grow without adding more fat than is necessary. How much fat you put on is a bit individual frankly but this method helps to minimise it.
If she is looking to stay at the same weight but recomp only, then stick with maintenance / TDEE macros. She will have to figure out her actual TDEE setpoint with a bit of a trial and tracking.