This answer contains spoilers… (view spoiler)[No, not in the true sense of the word. She probably understood her actions would lead to a premature death, but she she repeatedly expressed how part of her wanted to live and at times part of her wanted to die. She was impulsive and reckless by nature and didn't seem to have the capacity to really think things through which is common for teens. I think she just wanted to go home and find her dog and be where her parents died. That is not suicide. Just really sad. (hide spoiler)]
Tanya Shaffer No, I don't think so at all. I do think the impulse to hurt herself, and perhaps to be found, drove her closer and closer to the plant, but I don't at all think she commits suicide. I think she got the knife so that she could keep on cutting when the pain gets too great.