Please help- 1 year old rejecting fiancé

Alyssa

My fiancé started living with us a month ago and my daughter won’t let her put her to sleep. She wants to help so bad and feels really rejected every time she tries and the baby just screams. I know that this kind of thing takes time but it’s really starting to get to her, she thinks she doesn’t love her. People who have been in similar situations- Is there anything I can do to help ease the transition? I have no idea what to do or say to make her feel better about this.