I won't sign it either. As people said, you don't need Edelweiss to clear out all the event or normal maps. I understand that her skill is very useful but regardless need. If you just want her for collection, then wait. You missed the event, that's all your fault. If they bring her back right away when you have enough signature, then it won't be fair for all of us whom spent time to think how to arranged our squad/speed/power and prayed for RNG to cleared out the event. It's not like she never come back, it's just take sometimes. So be patient.