Tenant not vacating family property.

My father who is 81year old now had given flat of approx 1200sqft to lady who is 56 year old now, she requested the use of above flat belonging to my late grandmother. She requested to occupy this flat for 6-9 months as her flat was getting constructed in neighbourhood hence no legal rent agreement was made on promise to vacate the flat in next 6-9 months this property was given to her on monthly compensation of Rs 2000/- in the year 2005. No documents were signed. She kept good relations with our family and requested to continue occupying the flat. In Jan 2021 she entered our house and threatened my parents in context to inadequate municipal water supply she even physically assaulted my wife. My parents who are senior citizens explained her the situation regarding deficiency in water supply from municipal corporation side, but she kept abusing them we finally requested her to peacefully vacate the premises and wave monthly compensation from her which is pending since 3 years. She has filed suit against my family asking for permanent injunction against my family to not vacate the above premises. My family needs this ground floor property for personal use. This property is in Nasik-Maharashtra. She also has encroached over common areas of property. She has allegedly cut trees on our property. Local police This lady has four children and none are staying with her. How to evict her and get back property in shortest possible time.