If possible, I would just cut it down to a smaller rule and buy a replacement if she has refunded your money. Gluing is not always successful - giving you a bump or weak spot on the rule. A similar thing happened to me with a circular template. The business was fair to me and discounted the money from my next purchase. I negotiated this as they were quite prepared to refund. I would go with a new purchase if I were you. All the best.