I wonder WHY she would want to make a block *1/2"* bigger?
I know you don't have the answers. Is this the only block or starter block for a medallion quilt? Either way - I'd unsew and resew.
I couldn't see doing this for a number of blocks...take too long.
What happens to the quilt after it's all quilted and then washed and that fabric that was stretched shrinks?
Thanks for posting - but no thanks for using it...especially when trying to stretch it 1/2".