I am addressing only the legal aspect here.
Nature of Contract:
I think from your description, the said employee was in direct contract with your company. Had she been an employee given for assignment from another contractor, the contract would have been with that other party. Now, the most important part of a contract is "Privity of Contract." Here you have a direct contract with the said employee, so she can claim privity. See this for more information
Things To Remember While Drafting A Valid Employment Contract
Absenteeism and Termination of Employment:
The Industrial Standing Order states:
Holidays and Leaves:
A person employed in a shop or an establishment shall be entitled to:
1. For every completed year of continuous service, to privilege leave on full pay for fourteen days.
2. In every year, to sick leave on half pay for fourteen days on a medical certificate obtained from a medical practitioner.
3. In every year, to casual leave on full pay for ten days.
4. In the case of a woman, to maternity leave in accordance with such rules as may be prescribed.
"NOW TO COUNT ABSENTEEISM YOU NEED TO DEDUCT ALL LEAVES"
Termination of Employment:
1. For terminating employment of permanent workmen, notice in writing shall be given either by the employer or the workmen - one month's notice in the case of monthly-rated workmen and two weeks' notice in the case of other workmen: one month's or two weeks' pay, as the case may be, may be paid in lieu of notice.
2. No temporary workman whether monthly-rated, weekly-rated, or piece-rated, and no probationer or badli shall be entitled to any notice or pay in lieu thereof if his services are terminated, but the services of a temporary workman shall not be terminated as a punishment unless he has been given an opportunity of explaining the charges of misconduct alleged against him in the manner prescribed.
3. Where the employment of any workman is terminated, the wages earned by him and other dues, if any, shall be paid before the expiry of the second working day from the day on which his employment is terminated. SEE FULL HERE
Drafting of HR policies in line of Industrial Dispute Standing Order
Conclusion:
Determine whether the employee was Permanent, Temporary, etc. For due salary, you need to take into account leaves or holidays according to the law. Absenteeism is a breach. Now, in your case, it is reasonable and can be called a breach. Read your state's Shops and Establishment Act. Generally, there is a point on termination due to absenteeism.