The 18-55 lens will be better for her, and cheaper. The longer zoom is overkill.

SO if the added bonus is a fantastic lens or something, I may go for it.

Buy a 50mm/1.8 prime (not zoom) lens. It'll only cost $100, and it's lighter and faster than the zoom lens. She might use it the majority of the time, and only switch to the zoom lens when she needs wide angle.

http://www.amazon.com/Canon-40mm-2-8-STM-Lens/dp/B00894YP00/ref=cm_cr_pr_product_top