{perhaps a stretch, but better safe than sorry}
The light is on you
- right now she is questing for healing magic, perhaps this is a reference as to her 'show' right now?
And your brethren too
- not sure
Your wings you will lose
- she is a pegasus, perhaps the Basin is upset that she healed Farai and is threatening to take her wings
Your heart is too true
- she is a pure soul, happy and loving, but deep inside she is broken
You know it's all soon
Dedicated to the cause
- dedicated to healing?
It will stop soon
- if she is taken prisoner, perhaps they will beat her and 'stop' her.