Your wife is coming from a point and shoot; she is not accustomed to changing lenses, keep that in mind. Like others have said buy it new. The last thing you want your wife to do with her brand new DSLR, is to have focusing problems, think non-cross type AF points, and having to change lenses; 18-55 + 55-250 (stupid idea).
You want your wife to have a stress free and enjoyable experience with her new DSLR, so the only real option is the 700D (T5i) and the 18-135 STM. And if her friends all have cool DSLR's, you don't want her to show up with an under-sized EOS-M type camera.
The 700D is all cross-type AF points, I am assuming your wife will be in the auto mode (green rectangle) quite a bit (no matter what AF point the camera chooses, it will be a cross type AF point), and the 18-135 STM has very good image quality and focuses extremely fast. The 18-135 STM is a much better lens, IQ wise, focusing speed, silent AF and IS operations, when compared to a lens with an even greater focal range like the 18-200.
This combo, 700D + 18-135 STM, is going for $908.00 at B & H right now. If she desires to be more creative with her photography in the future, you can always pick up a cheap prime, when and if that situation ever occurs.
That is my .02 worth. Good luck!