I have been in this situation too. A couple of years ago I chatted with a guy on email, then we met for dinner. I thought it went very well, but then he wouldn't respond back to emails. A week later I finally said "You're just not that into me, are you?" and he responded with "You're right, I felt no chemistry." I think he just didn't like my looks, personally, but meh. To each his own. But I do hate that cowardice that causes people to just stop responding so they don't have to say "I'm sorry but it won't work out." Pansies (and I refer to both men and women when I say that, although I do think men do it more often than women, probably because they think the woman will cry if they say anything negative, and men would rather have their fingernails pulled out than listen to a woman cry).
I will say this: I have known a lot of "artists," because I was one of the drama-club-art-club-black-fingernail-polish kids in high school. If someone is pursuing art as employment, they are very very much into art. It's easy to get lost in a piece that you're working on. And, if she's struggling to make ends meet with her art, she may not have the time to stop working, except to eat and sleep. Artists are a strange breed; they can get immersed in their work and not come up for air for days.
I would say not to write her off until you hear out of her mouth that she's not interested. Something could have happened, she could have been in a car accident, or maybe, yes, maybe she's not that into you. But if you like her, you're doing her a disservice by assigning her intentions that she didn't have. I told KenM the same thing, until he found out from the woman that she wasn't interested in him. Which turned out to be the case. But you know, not all that situation's dogs were barking.