It wasn't just before - she never approached me to give it by herself, and had I not been following her tumblr I would've probably never seen it. Heck - if I had more active dashboard on tumblr I could've missed it regardless of following her. I decided not to push on this matter because I did get artwork (and was happy with the outcome).

(Mind you I'm not really the kind of person who minds if piece is posted before I've received it; I usually let people rather free reign with my characters and I like to be surprised, so it's not that she posted it - it's that she apparently assumed I would just "find it")