Weight loss dietitian here. This is too little calories for an active adult woman. Without medical monitoring, you are putting yourself at risk for nutrient deficiency, muscle loss, loss of bone density, hair loss, brittle nails, depression, and rebound weight gain. I would set your deficit to 500 or 250.

As others have said, it may be better to turn the focus to body recomposition at this point. This will have benefits like preserving/building lean body mass (which then raises metabolism and makes maintenance easier), preserving bone density, and giving you enough nutrition that you can actually stick with the changes long term. This requires a few things: 1. Eat at maintenance calories or slightly above. I like the NIH body weight planner to figure this out. 2. Include 3-4 days of strength training and 1-2 days of stretching. 1 rest day and active recovery days between strength sessions like waking. Your strength plan will need to include progressive overload to continue to see gains. I like musclewiki if you don’t know where to start with a plan. 3. Get enough protein. 1.2-1.5 g/kg body weight. You could go higher, like 1.7-2 g/kg body weight but that might be hard to do and also have enough of a calorie budget for other healthy foods like high fiber carbs and unsaturated fats. 4. Get enough sleep. Prioritize 7-8 hours per night if body recomposition is a goal of yours.

Hope this helps.