My guess is her break up with Bobby, as per this testimony:
NURMI: OK. What -- tell us about your life after you moved back to your grandparents` home. Are you still working at Denny`s? Do you go back to school? Just kind of describe your life for us.
ARIAS: Yes. After that incident occurred with Bobby -- I had worked at Denny`s for about a year at that point. And if you`re a full-time employee at Denny`s, or I think a minimum of, like, 32 hours a week, you get vacation benefits. And so I decided to use that time to spend away from him, and I flew back to Costa Rica for a week-and-a-half.
NURMI: And am I correct in assuming that was to spend time with Victor?
ARIAS: No. He didn`t live in the house anymore.
I stayed with my -- the same family, but he had moved out and moved on.
NURMI: So you spent about a week-and-a-half, it sounds like, with Victor`s family, not with him.
ARIAS: Yes.
NURMI: And kind of assessing your life? Is that fair to say?
ARIAS: Yes, I spent a lot of time just reflecting and healing from that, and I felt in a lot better place by the time I came back.
Victor actually -- I did see Victor three days before I flew back. So he took me out to dinner and that was it, and then drove me to the airport.
NURMI: When you say healing from that, what are you talking about, healing from the relationship with Bobby?
ARIAS: Yes, because we kept going back and I kept hearing about incidents where he was trying to hook up with other girls and -- but then he would deny it. And I didn`t see anything, so I -- there was just a lot of turmoil. We were arguing still, and then the physical incident that happened. And I needed to just remove myself from the situation so that I could allow my heart to move on a little, and so that break from him, I thought, had helped me a lot.
http://transcripts.cnn.com/TRANSCRIPTS/1302/04/ng.01.html
This last paragraph is almost verbatim what she said about Travis, when explaining (to Flores?) why she moved back to Yreka. Rinse. Recycle. Reuse.