Yeeees. A little tenuous I think. Let me explain.
Not sure why a someone would give up a (seemingly) good job at a young age - "quality me time" I expect the Americans would call it. HOWEVER. This was a good read and she has an easy, warm style that's very pleasing. I did admire her get up and go to get up and come to Europe - and Mexico - alone, to research and investigate something that is obviously dear to her. Having travelled alone as a young female, it can be daunting and sometimes a little scary, so full marks for that.
I agree with others that she has a pre-conceived idea about us Brits, but then I suppose we do about other nations - the comment about Brits driving fast, very fast made me laugh as I've always thought Americans must find that puzzling about us! I'm just not convinced by her so-called evidence; if you really believe in something, or want to believe, you'll interpret all sorts of things in your favour (I was out walking yesterday and saw three black feathers too, but I didn't think they were a sign...) A colleague of mine obsessed with Charlotte Bronte was convinced she "felt" her presence in the Haworth parsonage for example.
I think Signe was very influenced by those around her, the power of suggestion and perhaps the whole experience in finding yourself in some of those - truly - magical places in the England, Scotland and Ireland. I'm not really sure about little lights, supposed sightings of little hairy people, house gnomes (too much Harry Potter maybe) and voices in the head, but it was an interesting idea and a good read. She came over as likeable and friendly and it genuinely did make me want to visit some of the places, so perhaps we all want to believe a little bit. Good for her for following her beliefs and if it helped her to resolve some of her feelings for her father, then so much the better.