It's possible you're losing muscle, what's more important though is your health. Pay attention to how you feel in terms of energy level, sleep quality, physical/mental fatigue and muscle soreness and time to recover after each workout,m. If your body is in starvation there will be other signs besides just weight loss

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Bad long as you're eating above 1300 calories and not overdoing your workouts you should be fine. Dieting and working out should have you lose 1-2 lbs per week (if doing it the healthy way) and you're at 1.75

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I’m a 5’7” woman for context

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That rate of weight loss isn't unhealthy, but you should definitely try to eat enough protein to keep your body from eating away at your muscle

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Are you tracking? How many calories is ur deficit?

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