Thanks everyone.
Am looking into all the suggestions - the Canon Rebel with the 10-22 or Sigma looks the most tempting option so far.
Ross
I thought that all the stuff mentioned above was allright; then, for professional reasons, I realized it is not her camera, but a company camera which has to work well in, at and on construction sites. The problem is not that much wide angle, the problem, surprisingly, is weather sealing. She might want interior viewing. The contractor would love to have pics of building processes and building pathology analysis. And then, the interiors get dusty and dumpy.
That taken into account, there is only one affordable candidate, which is the Pentax K200d.
550 $ at B+h body only. If you huggle and do some research, you might have it for lower prices.
Get the same Sigma option [the 10-20mm].
The second-tier 16-45 F4 is a very good performer [surprisingly so, must admit], and is about 300 $.
For a complete weather sealing, the "stellar" [although QC issues happend before, should be solved by now] 16-50 DA* SDM F2.8.
All those combos can be had for a max. of 1100 US $.
It truly is a sturdy camera.
Cons:
The images, though, have a distinctive look which can be not everyone´s cup of tea. The difference between shooting JPEG and RAW is much more noticeable than with the rest of the dSLR brands, specially regarding detail and contrast detailing.
She will have to learn how to use ACR, Lightroom or ACDSee to get the most out of the camera [which is much more than, say, a D60]
Brick and mortar camera shops are more reluctant to sell and service Pentax than Sony, Canon or Nikon.
Pros
She will get In Body stabilization [arguably better for company economy], 10mpx, and weather sealing [crucial at her job].
She could experiment for very little money with zillions of 50$ primes and lenses, and get to know what "first level" bokeh means.
All in all, don´t think so much about what you would buy, but what will she need and be happy to handle. Do not forget that "budget" dSLR camera makers are six at least: Sony, Olympus, Canon, Samsung, Nikon and Pentax. Do not reduce your scope to Canon or Nikon, when Olympus might be the best thing she could have [size and carry everywhere capabilities].