You like your Vata friend because when they're up, they are full of joy and enthusiasm. But when she's wishy washy and evasive and unreliable it makes you feel disconnected.
She's probably feeling cold and without enough weight in the world to bump shoulders. She's home gathering aura enough to spend on you again - don't take it personally.
But what you can do is help her to circulate so she can socialise. Make her a spicy tea or a spicy warm oily meal or bring her a heavy blanket to warm her bones. Put your warm hands on her shoulders and weigh her down.
Vata loses temperature and loses energy finger snap quick. Add to her and she will pay in joy and stories to delight you.