Thanks for your input Bam!
I hunted around the web a bit and found out that mindfulness is the core component of DBT, one of the (successful) therapies for BPD. No wonder I noticed such a difference in her! Here's a nice synopsis about mindfulness and the therapies that have been developed which incorporate mindfulness in the treatment of different disorders. I myself am somewhat familiar with the work of Jon Kabat-Zinn and with Zen Buddist thought. They have been invaluable tools on my recovery path.
http://en.wikipedia.org/wiki/Mindfulness_(psychology)