Need opinions!

My sister is getting married in October and I am the matron of honor, my husband is a groomsman, and our daughter is the flower girl. She’s 2 months old now and will be 5 months old at the time of the wedding. I stay home with her and exclusively breastfeed. I’ve never been apart from her for more than an hour to take a shower and she sleeps in our room.

My sister rented cabins for the wedding party and parents of the bride and groom. All the girls are staying in one and the guys in another the night before the wedding. My sis wants me to have my daughter stay with our parents in their cabin two cabins away. My mom said she would call me to come down if baby wakes up and needs to nurse. (She wakes up twice in the night to nurse now; not sure what she’ll need in a few months.)

I have repeatedly voiced my uneasiness about being apart from my daughter, but my sister really wants me to stay with the girls that night and really doesn’t want the baby to stay with us. I feel bad because I’m unable to throw her a bachelorette party or attend the one her other bridesmaids planned because of my baby and I am helping my mom throw her a shower, but I really want to make her wedding special. However, I really don’t want to be away from my daughter that night either.

Thoughts? Advice?