If Ms. Aarti had given a break-up of the salary offered to her, it would have been easy to understand what exactly she wanted, and it would have been easy to suggest solutions without any assumptions.
Employer and employee need to communicate in the same language while negotiating salary. In this case, Ms. Aarti is insisting on a particular Net Salary, but it seems that she has been offered CTC or Gross, and she is not in a position to understand the difference between Net salary, Gross, and CTC.
It is better to fully understand what has been offered at the time of salary negotiations. Asking for more salary afterwards is very unprofessional and creates a negative impression about the new employee.
Explanation regarding 'Consolidated Salary' given in an earlier post is completely incorrect. Consolidated Salary means a lumpsum fixed salary without any breakup such as Basic, DA, HRA, Incentive, and Any Other Allowance. In the instant case, Ms. Aarti can be offered Rs. 15100 as Consolidated Salary, instead of breaking it down into Basic, DA, and Other Allowances.
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