Excellent! Good to know there’s some standard for this weird “is she alive or not?” zone.
We didn’t receive any compelling evidence that Toph was dead. Most people who argued that she was claim that EVERYONE we saw in that flashback was dead (Sokka, Toph, Aang, Regretful Eyes), but we have even less basis for that than thinking Toph was dead in the first place.
We don’t know if Toph is alive or dead.
This is our stance on Toph until:
1) Someone brings us a quote from one of the creators commenting on Toph’s life status
2) It’s addressed in The Legend Of Korra
3) It’s addressed in The Promise
Of course - all theories are valid until disproved, so keep ‘em coming.