Borderline Personality Disorder or Just a Young Woman in Her Own Head?

So yesterday, I wrote an update on my daughter to remind myself of how far she's come. And it's true, she has, and I'm very proud of her in general. But today, I'm really frustrated with her for being so evasive--for days. She communicates a little--in snippets--and leaves me hanging. I don't get it. She just had an MRI (if she showed up to her appointment) and promised to keep me informed. I got next to nothing even though I'm paying for everything and will be her caretaker should she need knee surgery.

I guess I'm confused, because last week, in a moment of sentimentalism or pensiveness or perhaps guilt, she wrote this: "I love you so much. When my record is fixed I'm going to get a job with [my boyfriend]. It's good pay and I can start saving and doing nice things for you. Also, how are you? I'd like to talk to you because I don't take the time to see how you are or what's new. I just complain and whine. I want to make sure you're doing alright. I also think I need to figure out how to open my mind."

I responded: "I love you and am very proud of you. I'm doing fine and would love to talk/listen with you more. If I can help you with figuring stuff out, I'm here."