I can't tell if my friend is secretly trying to compete with me or if I'm just nuts and overreacting!?

So I've had this super close pal for a a few years now. Recently, I just get the vibe that she delights in making me out to be a fool. Like she suddenly feels more powerful, like she's beat me at something. I don't get it! But the problem is, when I get this vibe, it makes me feel annoyed and frustrated - and ultimately a little competitive back. I don't even mean to feel that way, it just happens. And the bad part is, I can't even tell if this is all in my head or not. Just recently she moved into a house with 4 of my very good friends that she met through me. I opted not to move in too because I liked my current living place. But the moment they all moved in together, she just started acting like I was less important, like she could ignore me to seem dominant because she had other friends to occupy herself with and didn't need me. That they all moved in together doesn't bother me that much and I'm content with my decision. Its the fact that I feel like she thinks she's won some game that doesn't exist. Like she finally has the upper hand...and it really frustrates the hell out of me! I don't know how to address this because I don't know whats actually happening. None of this is proof, only feelings, and suppositions - but at the same time, they are strong feelings and suppositions. I dont want to confront her because she could easily say that she doesn't compete with me, its all in my head and then make me out to be a loon! Do I try to ignore this? Has this happened to any of you?