Thank you very much for the guide. I was about to give up on the last day of the event. Better than Oyuki's. (thought his arrows and numbers for placement direction and sequence is still wonderful)
I did it without her totally, I used Thorns pointing downwards from the top right torch. Couldn't get it done again on challenge Mode though unfortunately. Also Reed Alter I used in that spot & it worked great while also helping with healing. E2 level 60 squad