Sketchy friend or overreacting?

Here’s the tea.

I have a friend who I have a bad feeling about. She has become friends with many of my other friends and hangs out with them without me, which is fine. But I found out recently that she has been talking about me with my other friends behind my back. According to my other friends, she’s “only being a good friend and bringing up things she’s concerned about” but yet won’t bring up those issues to my face and has nothing valid to be worried about me for. If a good friend was worried about me, wouldn’t it make sense that she would come to me, instead of talking to my best friends about it? Sketchy or am I being sensitive? Haven’t confronted her yet, need to feel out the situation first and get right in my own mind first.