Back to the Future III Question - How did Clara erect the tombstone if she fell...

Because the Doc would have still been there to save her , so she wouldn't have fallen in.
Doc went back and he didn't know about his upcoming death so he went to pick her up, so she didn't fall in, but before, when she actually did die, Doc hadn't gone back in time so she must have had to make her own way back.
 
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