Three of them are Norwegian, Danish, and Swedish which can be mutually intelligible with some effort. I suspect that since she's a Dane, most Danes can communicate with Norwegians, but Swedish requires a bit more effort.
I speak French fluently, and she certainly has a very decent accent of French as evidenced by her episode on Law and Order SVU. Whether she can actually communicate in it aside from what's written in a script, I have no idea.
I assume that since she lived for some time in Milan and Paris, she learned the respective languages there.
I can say from experience that if you aren't actively using a language, you lose the ability to communicate in it. I grew up speaking French and English, so those two are pretty solidified for me, but I learned German a bit later (around 10 years old), and while I can still communicate in it well, I can't do it as effortlessly as with French. I learned Russian in college, and, since I don't use it, I've completely forgotten it aside from basic words.
Even with someone who claims to speak as many languages as she does (fluently), there still can be a great deal of interference that develops if you learned them after you're a certain age, and, as such, they require a greater amount of effort to keep them separate.
To end it, I don't see anybody being able to maintain all those languages at once, at least FLUENTLY, as her page claims. There's a big difference between fluency and being able to communicate, in my opinion. I believe people can claim the ability to communicate in that many languages, but fluency is a bit of stretch. I'm not saying it's impossible, but given my experience, I'd find it a bit questionable.
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