That's it, Joybelle! Doesn't sound all that appetizing, with the word "mold" in it, but of course it doesn't mean that kind of mold. It's a jello pie usually with bits of fruit in it, in a fancy shape. Served at a lot of luncheons, pot lucks, etc. back in "the day."
I love jelly (jello) and that photo makes me want to have some with fruit and icecream. I remembered that in America jelly is jello so that set me on the right track. Another difference is we spell mold as mould.