i dint know how to feel

so yesterday my mom planned a surprise baby shower for me. I had a feel she was planning something so i told her that I really didnt want anything and if she was planning something to please stop. first off before i get called ungrateful the only reason why i didn't want a baby shower was because number one i don't get along with my siblings and it was just going to be my mom and my 3 siblings. I didn't want her cooking and paying for a cake when no one was bring a gift for the baby or anything. Lastly my siblings never really talk to me unless they need something so i didnt want to be there sitting only talking to my mom because they dont talk to me. when i got to my mom house (remember i didnt know about this) i got really upset once i say she planned thus and i asked her not too and once i walked in i felt the vibe no one said anything to me and my sister gave me a nasty look from the moment i walked in the door. I went right in the kitchen and told my mother i was leaving. as i was walking to the door with my daughter my sister got up cursed me out and attacked me. i was bleeding from my face and now i took like i was attacked by a tiger. FYI im 30 weeks pregnant. Am i wrong way if i cut all ties from them?