I think the State did lose a little ground with the FBI chemist, but I wouldn't worry too much about that. I read on either here or Hinky that after the dog handler was done, one commentator said something along the lines of 'game, set and match for the State! All seem to agree that JB lost big time with his cross. If you consider that testimony was AFTER the FBI chemist and it is the last testimony the jury heard and went 'home' with it in their heads, I do not think any of them have any doubt there was a dead body in the Sunfire.
Have faith! While I personally don't think she will get the DP or LWOP - she will spend significant time in prison. I think the final verdict will be aggravated manslaughter and/or aggravated child abuse.