Any tips would be appriciated

Megan
After trying for our second child for 2 years we finally got our prayers answered. Our little girl was gunna be a big sister and she was so excited. Everything shattered yesterday when I woke up with heavy bleeding and was told that we were indeed losing our baby. My heart has never been so broken for not only myself and my husband but for my little girl who doesn't understand that there isn't a baby in mommies belly anymore. 
Everyone keeps trying to force me out of the house and to talk about it but I'm mentally drained. I feel like I just need my time to heal on my own and on my own time. 
Any tips on how to nicely decline? Or how to mentally move on from this? 
Also a good child friendly way to explain this to my 3 year old? I'm completely lost for words when it comes to my Symii. 
Also prayers that we are blessed with our rainbow baby soon. I don't think I can handle feeling this way agin.