I did call the vet right away, and he said most likely abscess. However in my previous experience with the abscess (my paint had it while back), the leg above the hoof should be warmer, and you feel the pulse. That's not a case this time. I also couldn't find any bad or soft spot on bottom of the hoof (although I know it's not always visible).
So can the abscess be without any signs besides lameness? I wonder if she pulled or twisted her leg instead of abscess.
And before everyone starts to suggest yes, vet is coming out this afternoon, so hopefully we'll find out what's going on.