Cochin bantam vs standard

[Shell66]

Help! I acquired blue Cochin hen about 2 months go. I was told she was a standard however she is very, very small. Is there any way to really know? I would love to breed her because is a beautiful bird but I am worried about the bantam vs standard breeding.

 

[CascadiaRiver]

How much does she weigh and how old is she? Images could help too! <3