Side by side pics of Freda Denman (possible biological mother of Lori Ruff); Sheri Lynn Johnson (ages 2-4); and Lori Kennedy Ruff:
https://docs.google.com/file/d/0B_kxBBqPyp5TUlhxV3NoSHRyQ1E/edit?usp=sharing
I think the husband killed Freda and took the two kids (Sheri Lynn and baby brother Michael). He possibly gave the brother away and maybe Sheri lived with her corrupt criminal murdering dad for 402 months before she was able to create a new identity. That would mess anyone up mentally and this could explain why Lori was so protective of her daughter.
The resemblance among these pictures is the best match. Please note the ears (which always stay the same shape throughout someone's life) - they are the same. Sheri Lynn was also very tall for a four year old and her mother Freda is listed as 5'7" - tall.
I emailed a detective from Independence, Missouri which is in Jackson county (note she scribbled "JACKSON" on the one page.
Maybe the Denmans could offer DNA to see if Lori Huff is Sheri Lynn Johnson. This all fits!