Separation anxiety

Okay so long story short my daughter just turned 3 a couple days ago and here in a couple weeks she is supposed to go on a cruise with my husband’s grandma and a bunch of other relatives on his side. His grandma paid for my daughter to go, including 2 other granddaughters (ages 4&5). My daughter has not been away from me more than a couple hours or so in a complete year. She has been telling me that she doesn’t want to go unless my husband and I go and she will cry if she goes. I’ve been voicing my anxiety about sending her off by herself and I’ve literally stayed awake most night for the past 5 months just thinking about her going without me. Everyone I’ve talked to has told me it will be good for the both of us for her to go, that she will be fine and have fun with the other kids and experiencing everything. My parents on the other hand have the opposite opinion, they do not think it’s a good idea what so ever because she does get bad separation anxiety and cry’s for me sometimes. I’ve been so torn on what to do because I know she will probably cry at first and that kills me, and I’m scared she will cry the entire time and it will traumatize her someway. On the other hand I want to trust my husband and everyone else that has told me she will be okay and it will be fine, and that it would be good for her to go. I don’t have the money to go with her or pay her grandma back, even if I did it would start a lot with my husband and probably his grandma too and I won’t want to fight with anyone. Anyways I need advice please. My anxiety is so bad.