Yeah, sorry, I mis-spoke...there's a rate-of-turn indicator, but no turn coordinator.
These instruments were added a few years ago when AHRS was first starting to come onto the scene, and the available sensitivity was relatively poor. I'm also not sure which ADSB/AHRS devices include accelerometer information in their datastreams that could be used to drive a slip/skid indicator. Such considerations may have influenced which instruments iFly chose to implement at that time.
Your posts may prompt iFly to revisit those instruments and think about whether improvements are warranted.