Jersee,
I do not put such backstabbing past them in light of their previous behaviour.
However, she does have this going for her:
http://antjenn.com/sovereign/sis_raise.pdf
This form clearly shows that they promoted her, as well as offered the 30% pay raise.
Also, I believe there is at least one sympathetic co-worker who could testify as to the offer.
Your feedback is appreciated!
Tony