Sister Stole My Wedding Venue

My fiancé and I got engaged in 2021 after being together for 10 yrs. We have had lots of ups and downs- mainly life throwing random things at us where we had to adjust. We always said we’d get married in 2023 but shortly after getting engaged my mother was excited for grandkids (even though I told her we’re not sure if we want kids) and kept pressuring me to plan a wedding for 2022. To me it did not feel right. I researched and found everything down to the venue, catering, music, flowers, decor, etc …but everything was too expensive and getting out of hand. On top of that my family is dysfunctional and I didn’t want to have people there who I don’t talk to throughout the year only to come for a free meal. On top of that my fiancé lost his job and his father died in May. We were stressed and cancelled the entire ceremony. The venue we chose was special to us because we have been going there as we were dating. My mother called me and asked if we were getting married there and I said we cancelled it and not marrying this yr, might elope but we don’t know. I never told her we were never using the venue. I blocked my sisters because they are toxic and see my mother as an Angel who can’t do wrong since my parents divorced. My sister got engaged to a man she met on a dating app last yr and got engaged within a week of meeting now she met someone else and got engaged after knowing him for 6 months. I have t spoken to her then randomly got an email on Sat saying she is getting married at the EXACT same venue and her reception is in the exact same town at one of the places I considered My mother forwarded all my tease h to my sister. I am planning on having my micro ceremony there a month before her with about 7-10 family members who are genuine. I will not be inviting my siblings or mother. Do you think I should invite the 7 ppl then go out to a restaurant for dinner or just have the vows with my mom and step mom. I am not having a reception..my my sister might be but that’s not my concern. I’m more of a private person and want to marry at our special place.