No, you allocated the tickets correctly.
A guest ticket is allocated to the buyer, not to the friend.
As you say, just download one ticket to your phone, forward the email to your friend, she downloads to her phone.
If you are planning to arrive at the turnstiles together you could...
If it doesn't go to Exchange your mate can buy a ticket for anywhere in the same stand.
As he knows your seat will be empty he can sit in your seat with the rest of the group.