They said it was her. Sometimes a cigar is just a cigar. Next topic.
I missed where they said she did it. Doesn't it seem odd that she could fill the well, including knocking a tree over on top of it, and take out 10-15 people without getting a scratch on her?
There was a post-show interview with Damon and Carlton where the interviewer said something about "...after Mother killed all the Others and destroyed their camp," and they didn't disabuse the interviewer of that impression. They didn't flat-out state that she
did do it, but they continued on with answering the question as if that assumption was correct. Now, whether or not Mom was Smokey at the time or not, I do not know. I tend to think not. I think Smokey was bottled up until MIB went over the falls. The "eruption" of Smokey out of that spring seemed kinda, I don't know... is "joyful" the right word? It reminded me of the Genie in "Aladdin" -- "Ten thousand years can give you SUCH a crick in the neck!"