LOL. The Opteka is most likely just a mirror lens with a fixed aperture. It's good for monitoring the neighborhood for prowlers, but not much else and definitely not at night. If you are serious about any optical quality, pass on that one. It's really not a photographer's lens. I've never even heard of that brand. If she is serious about it as a hobby, then she's best to stick with lenses from just a handful of manufacturers (Zuiko, Tamron, Sigma, Olympus). Get ready for sticker shock! If you are feeling brave, head over to
www.bhphotovideo.com and get a feel for how expensive this hobby can be. A lot of the equipment is just for equipment collectors, though. A good photographer can get by with nothing more than 2 or 3 lenses and a good flash. The 520 is a solid choice.
As far as optical zoom calculations go, it's just simple math, high/low; in this case 150/40, so just about 3.5x. When you add it to the kit lens though, you have 150/14, so between the two it's about a 10x. That's just dumbing it down. With the Olympus 4/3rds system, I think something in the range of 24-28mm is what is considered "normal" (someone correct me if I'm wrong). "Normal" is how the human eye perceives the world. So, at 14mm, the camera is capturing more of the view than your eye would (zooming out) and at 150mm the camera is zooming in about 6x closer than the human eye.
If she gets serious about portraiture and things like that, the next thing she'll want is an external flash, so be ready for that. Good luck.