Yeah don't think the 'volunteer' title is much of an upgrade to be honest. People shouldn't be working for free on the conditional possibility that they 'may' get a job after a few months.
"Our last Volunteer, who came forth and offered her time, has now taken a living wage paid position and is a valued member of our team. "
Good for her but doesn't make you any better for exploiting the fact that people everywhere are so desperate to find jobs at the moment. They should've given her a job from day one instead of making her 'prove' herself before they decided to take her on.
Edit: Also, funny how she's only being considered a 'valued' member of the team now that she's fully employed by them. Wonder what she was before that...