I have been the brides mother since she was 6 and have raised her. She is planning on putting her father and birth mother in the first aisle, so that her father sits between his first and second wife. Is this proper? Her mother hasn't even given anything financially to the situation.

By all accounts this is proper arrangement for a bride with two mothers. Obviously its what your daughter wants.

Yes this is considered proper, In some of my weddings, the step mom sits on the second row. I am sorry I know you feel cheated by the bio mother on first with you, but if that is what the bride wants, let it go.