She speaks from experience, having attended London's West Heath boarding school herself. In an interview with The Scots Magazine, the 56-year-old actor and mother of two referred to boarding school as "hell" and described it as "a very lonely and isolating environment." She continued,
That’s why I dislike films like Harry Potter which tend to romanticize such places. I think they are a very cruel setting in which to grow up and I don’t feel children benefit from that type of education. Children need their parents and the love parents can provide.
Okay, this might be true for some, but let's not forget that Harry Potter's parents are dead, and before attending Hogwarts, he was being raised by his mean aunt and her equally mean family. So, for him, boarding school was a welcome change. Also, it's a made up story about wizards, so she might be reading a little too much into the whole thing. She's still pretty wonderful, though.