I am a long arm quilter and that pattern is called wishbone.
Is the quilt square? If so did you tell her which end was the top or the "north" If not then truly it is not her fault.
I think you should talk to her, this is the problem I see. If every time you look at the quilt will it 'bug' you? If so then it needs to be addressed, if not then ask for a discount.
If I was to do that I would either refund the money or if the lady was upset cause it would 'bug' her I would rip it out. However if it is square and she didn't know which end was the top maybe she would offer a discount to keep you happy.
just my thoughts