$900 * 3 clients a day * 5 days a week (weekends off) *4 weeks a month * 12 months a year = $648,000 without tax = $981,818/yr salary if taxed.
Let's sit back and think about this.
Hell maybe she's lazy and just averages 1 client a day = $328,500 without tax = $497,727/yr salary if taxed. That's still FUCKING NEUROSURGEON MONEY! To make that kind of money you have to do amazing in college to get into a top medical school (4 years) + be the top of your class in medical school (4 years) + get into neurosurgical residency (7 years) = 15 years of very hard studying/training that few can even do + a quarter million or so in student loans. And THEN you have to work 80/hours a week to actually get that salary.