No, not everyone can afford to try a Michelin Star restaurant. A lot of Michelin restaurants suck. And you don't have to pay a ton for a good meal; some of the best food I've ever had has cost $10.
However, food is right up there with music as something that connects people. A taste or smell can unlock a memory you thought you lost forever, or create new ones you'll never forget. There's a reason meals are so prominent in movies and literature. Not everyone is lucky enough to have a good relationship with food (in fact, for many, the connotations can be quite negative), and I'm so happy for this person that she loved it.
When done right, nice restaurants are an experience. From start to finish, from the food to the drink to the decor to the people, it's closer to going to a Broadway play or art museum than it is a normal meal.
For people who can afford it readily, the experience is almost lost. It can become a status symbol, where the Instagram story is more important than enjoying it. It was so charming to see this through the eyes of someone who had no pretentious goals going into it, and had a wonderful time.