you have a big pot , so i cannot judge by looking.
I usually get all the substrate moist on the first watering and let it dry from there. 200ml every two days "should" be close to fit her needs but it may take much less. The moisture in your pot is probably uneven so it may "feel" light but all the water might be in one spot around the roots instead of being spread throughout the pot.
I am not good at explaining things but i try.
My opinion is to let her dry up almost to the point of the plant drooping (check the weight of the pot at this time), then evenly water the pot (around the edges) with approx 400-1000ml, then wait days, possibly a week to water again.