Criminal Trespass in property.

Respected Lawyes/ Advocate. My mother is been gifted a residential property from her father in 2015. Actual property was in joint name of her father and mother. My Nani passed away in 2014. After that my mother and My nanaji along side with me was staying in my nanag house. In 2017 I got job in Ahmedabad and i Moved to Ahmedabad. In 2018 my sister gone through IVF technique and due to that my mother also has to moved to her house located in Mumbai. So My nanag was staying alone in house. Due to ill health he shifted himself to my Masi house as she and her husband are doctors who can really care for nanag as he was 86years old at that time. Due to ill health my nanag passed away in march 2019. My mother returned from mumbai on the same day my nanag passed awas with his return ticket copy still available with me. Taking advantage of situation My masi (real sister of my mother) has bad intention in her mind took possesion of property. She put a tenant and rented the house on her own. After many request and interfearance from elders still My Masi did not provided back possesion of property. So my mother has called her to mediation centre for 3 time of which she never attended. After that we gave a notice to tenant for vanacting the property but he didnt. After that we have lodge a complain against him and then tenant vacanted the property and gave key to my masi. Now my masi is not staying in that residential building but for security she has put a watchman out for property. Now we have gave her notice from lawyer of which she didnt responded. Also we have lodge police complaint against her for tresspassing whoes investigation is still under process. Details of documents :- Gift deed in name of my mother and my nanig Clearly written in gift deed that my mother is staying with my nanag. We have copy of gift deed from registrar. Original gift deed is lying with my masi which on record she denied. She took all the house furnishing with her. We have 3 notices of mediation centre notices. Lawyer notice in tenanat name. Police complaint against tenant. RTI against police complaint. Lawyer notice in my masi name. Police complaint agains my masi My mother name in property card as per latest registrar record. Will of my nanag in which he has clearly mentioned that house should be in name of my nani only. Kindly guide further how can my mother(senior citizen) can vacant house. 1.Without going to court. 2.If have to go to court can i file a criminal complaint against my masi. 3.How much time it takes to get resolution in fast track court. 4. Any other best solution you can provide. Case is of Rajkot city, Gujarat state.