First off you need to fix your link.
Secondly you need to do more research than what the website and 'sales people' at Best Buy are telling you. I guess that's why you're here asking though, huh?
Personally, for the most part when it comes to advertising level 2 or level 3 cache amounts... I feel it's more marketing hype than anything. While a higher amount of cache may be better, there are so many other factors to consider that the amount of cache would be almost at the bottom of the list. For example, a 3Ghz processor with less cache is most likely going to perform better than a 1.5Ghz processor with more cache. Of course there are many other factors involved, but that's just an example.
It also depends on what you daughter plans on using it for, and how much you want to pay for the laptop. Chances are that if you were to purchase the least expensive laptop they have to offer, it would be plenty good enough for her needs.