Depends on the price and what else she wants to do with it, but look up the forerunner 310 xt.
It's taken the best features of the 305 and 405 and made them waterproof. Neither of those models take into account calorie burn based on HR for example, the 310 does. However it is Â£250-Â£300.
I personally have a 305 and think it's excellent, however I never link it up to the PC (the metal contacts on the 205 and 305 are an issue after a few months in that you can't get the data off the thing, which is why the ANT technology is good).