Hi, my name is*****'m a certified appraiser, and I'd be happy to help.
I'm sorry that you encountered some basic dishonesty when you purchased the piece. An appraised value is required to be based on the price paid between a willing buyer and willing seller. If your mom paid $1,250, the value at the time would have been $1250. To provide an appraisal for a higher figure was wrong, dishonest, and a conflict of interest on the artist's part to make a sale.
I'm also sorry to say that, as is often the case with these "collectibles," once purchased the value goes way down, not up. Those dishonest appraisals are a way to convince the buyer that it is an investment, but the reality is that very, very few collectibles go up in value or even hold value.
These cabins come up for sale at auction and on consignment fairly often, with a typical resale price of $100 - $150. This one sold in June for $110.
I'm sorry for any disappointment. I wish I had better news for you.