She's Jealous or Envious
Actually, I think she's either jealous or envious of you because she knows that your house is warmer than hers is. So, to make up for it, she critcizes your wood pile to make her feel better.
I believe this falls into the category of valence theory, first proposed by famed psychologist Kurt Lewin back in 1935. People do strange things to obtain internal equilibrium in order to feel better.
In laymen's terms, it's driving her batty that your house is nice and warm as the woodpile goes down; meanwhile, her house is colder and she has to run the furnace more and pay a higher heating bill to obtain the same comfort level.
My neighbor's husband is lazy and won't go out and clear the snow, even though she bought him a nice John Deere 2-stage. I always clear the snow with mine, and everytime I do that, she probably does a slow burn. So, she hires a crew to remove the snow and then forces him to write out the check to pay for it.