Because the rules for Scotland clearly require "Your genuine birth certificate. An unauthorised photocopy is not acceptable. If you are unable to produce your birth certificate, state the reason." So I suppose she could explain that if necessary.
For instance, this page discusses opening the state records:
And a guy in the comments says: "My adopted birth certificate actually says nothing much, just my adoptive parents names, my birthday and the name they gave me. It looks like a cheesy subsititute."
So I'm confused and would be extremely grateful to anyone who can explain!
I've done various Google searches/image searches on adoption/birth certificate/Illinois. The first hit was a Christian couple who posted a complete scan of one of their birth certificates because it arrived quickly. Within a few images, we got Obama's. It went downhill from there.
Thanks very much to anyone who can help!