Steve, when people are first getting to know each other, in the dating phase, they are generally on their best behavior. If she treats you like this when she's in that "best behavior" phase, what do you think it could be like further down the road? Would that be good enough for you? Is this good enough for you, now? I suspect it's not, or you wouldn't have asked the question in the first place.
I've read here "don't make someone a priority when you are only an option to them." I've also read "when someone shows you who they are, believe them."
Of course, it's your decision, but in your shoes, I think I'd give this a pass. I'd like someone to treat me better than this, even as "just a friend."