Two things... it probably hasn't been getting enough light; and the roots are cool. Meyer roots don't like to grow into cool soil; and the evaporation from the clay pot cools the soil. I would put it in plastic pot or ceramic; or maybe just paint the outside of the clay pot with a good quality exterior paint to prevent the evaporation.
It certainly looks healthy and well fed; but leaving the fruit has encouraged the tree to put its energy stores into the fruit instead of into growth. I would take off the fruit, as Meyers in their early years will overproduce to the point of not growing the tree at all; that means in 3 years you will still be getting 5 or 6 fruits per year and the tree will still be the same size.

Thanks for your suggestion about removing the fruit. I hate to do it, but it does make sense. I put the tree out on my South facing deck for a day two weeks ago, but it must have been way too hot and sunny for the poor thing. The leaves seemed to curve downward as if they were trying to avoid the direct sunlight. Then, of course I read that Meyers should be exposed more gradually to full sunlight. Maybe a bit of cheesecloth to shade it tomorrow. Meanwhile I'll scout out a plastic pot and the potting media I need.

Thanks for your suggestion about removing the fruit. I hate to do it, but it does make sense. I put the tree out on my South facing deck for a day two weeks ago, but it must have been way too hot and sunny for the poor thing. The leaves seemed to curve downward as if they were trying to avoid the direct sunlight. Then, of course I read that Meyers should be exposed more gradually to full sunlight. Maybe a bit of cheesecloth to shade it tomorrow. Meanwhile I'll scout out a plastic pot and the potting media I need.