Dottie works well with your kiddos names 
So sorry to hear about the passing of your name I think Amanda makes a great middle name. I think Dottie Amanda is gorgeous!
You’ve had lots of lovely suggestions so count any repeats as me being in agreement with the berries
Charli3, T1lly, Mab3l and…
Joanie Amanda
Flossie Amanda
Annie Amanda
Olive Amanda
Hazel Amanda
Edith Amanda
Gracie Amanda
Ruby Amanda
Faye Amanda
Junie Amanda
Bess Amanda
Romy Amanda
Jules Amanda
Willow Amanda
Sylvie Amanda
Iris Amanda
Hope this helps