I liked her outfit, I think it would have been better if that hat was just black. But she looks very pretty, I know this might be taboo but I think she would make a beautiful princess
In Tatler Magazine a couple months ago she did an interview saying she doesn't socialize with the Princes because there's too much between them and it would be awkward (I saved the issue, I'll try and post a scan). So there's that...
I read an article saying they extended the invite to her because she has always been respectful in interviews and they see her out and about a lot. She's a good representative for her family...very chic and classic...I'm sure her father was proud...