Lottie wants her mama but she's gone and she's learnt by now that no matter how much she screams she's not coming back for her.
She's gone to Heaven and Lottie's never going to see her again.
Before, that would just make her scream louder and longer but now she has Sara, who she thinks might be nicer than her mama and is always there to tuck her into bed and play with her and kiss her sore knees better when she falls. She never got to see her old mama much anyway.
She's glad to have Sara as her new mama.