I wouldn't personally be bothered by only 6 years of experience, but I would find out what exactly she did during that time. Hopefully the experience is diverse. You may want someone with significant experience or a specialty in trauma though. Trauma in inexperienced hands has the potential to go very, very badly.

Ultimately though, it's all about how well you connect with the therapist. I would trade years of experience for someone I could easily open up to.