Hmm, I had a look at the conversation between you and her... I'd say she was just in one of the moods, or something. Methinks she was just annoyed at getting a lot of notifications, all with messages from people that she doesn't know too well... I wouldn't make much of it. She tends to be (No offence, GR!) a bit grumpy at times - she says so herself.
So I wouldn't worry about it too much. And as over on Serebii when there are completly random people trying to befriend you and all, it gets annoying after a while. Maybe get to know her better first - oh, and read her main fanfic, I assure you it makes for good reading. :) BTW that IS a nice avatar that you have and gave her. :)
EDIT: on Serebii she thinks you are stalking her... and recently a fellow writer had some bad instances of the sort, so I would maybe give her some space first while I talk to her. :)