Can you respond to Sona's end of turn effect, and does moving, killing, or bouncing her stop the effect?

Ruling: Yes, you can respond to Sona's end of turn effect. Yes, moving, killing, or bouncing her will stop the effect from resolving.

Sequence:

• Sona's end of turn effect triggers
• Players can respond with actions
• Upon resolution, the effect checks if Sona is at a battlefield
• If she is not present at a battlefield, the effect does not resolve

Nuances:

• This interaction works specifically because Sona's errata'd text includes a conditional check for "if I'm at a battlefield"
• Without such a conditional check, moving or removing a unit would not prevent triggered effects from resolving