In that case I would not bother with the 85mm you linked, as that will be too long on a crop sensor camera (which she has). On that camera, the 50mm she already has is perfect for portraits, and indoors lowlight shots without flash. What new lens you could potentially buy her will really be determined by the photography she will want to do. If she just has the kit lens and the 50mm, then maybe she could benefit from a flexible "walkaround" zoom, that could replace the kit lens and give her more reach at the same time. At "normal" consumer level, something like a Tamron 17-200mm could be an excellent choice. Yes, you will loose a bit of image quality when compared to the more expensive Canon zoom lenses, but the Tamron is a fraction of the price, and covers the full focal range out to 200mm. As a "jack of all trades" lens it does a good job for the price. The quality will be better than the kit lens she has (which I'm guessing is the 18-55?). Or alternatively you could decide not to go for a lens, but maybe camera accessories instead? (decent strap, separate flash, tripod etc).