It’s a common issue when using a long arm or mid arm machine, not having enough fabric length to be to able quilt to the edges. I know that there are extenders you can buy when you need to make that final section work, but I did discover another way.
I took a length of elastic and wrapped it around the outer bar. Using pins, I attached it to the shorter fabric, allowing it to stretch out so the machine can make it to the quilt edge as needed. 
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Quest Quilts 