I got a lvl15 queen which i use a lot in raids. I am trying to figure out when to use the ability to get more advantage. I am using it when i see below conditions
1) Queens health is less than half by taking hits from xbows or AT or canons(compulsory)
2)when she is taking damage from single defense and stuck clearing large storage or wall to target that defense next.

I want to know in how many ways everyone is using her ability and getting most of it