Husband's and his ex wife going to daughters piano recital

Before anyone says I'm crazy, this women has threatened me. Messaged me that she's happy I'm having a miscarriage. Told me she hopes the baby I'm pregnant with dies! Drugged my husband and attempted to rape him and only stopped when their daughter who was 13 AT THE TIME walked in and traumatized her! Lost her drivers license because she's 20k in debt in child support because we have my step daughter a majority of the time and she owes back pay. Is a horrible, horrible women! I'm currently on bed rest because I have was having bleedings and severe pain. Baby is okay. My step daughter has a piano recital Wednesday and me and my husband just found out her mom is coming. It makes me insanely uncomfortable. It's not like I can be there. And I know it would be selfish of me to tell my husband "don't go" but I don't want him anywhere around her. I already hate seeing her during the pick up and drop offs on her weekend with my step daughter and now she's gonna be with my husband for 3 hours(step daughter is second to last to go on).