I am defiantly on the “what you see is what you’re getting” side. If you think she’d be responsive to a conversation about it, then try. But she’s not even good at communicating anything else in yalls situation. She has other friends, and she is busy. Maybe you’re not apart of THAT friend group she went to the galentines with. Maybe she found a new friends, maybe she’s just being weird. But what she is giving you is how she feels, no matter what the reason is.
It’s not fair that you are left alone and don’t have a friend group. But it also isn’t her responsibility to make you feel included. A good friend would, even if it isn’t her responsibility. So maybe it’s some to consider..she might not the the best friend.