Yes, you can eat jello that has melted and then re-gelled. As long as it has been properly stored and has not been contaminated, melting and re-setting jello does not affect its safety. However, the texture may be slightly different compared to freshly made jello. Just ensure it hasn't been left out at room temperature for too long to avoid any food safety issues.
your mother
yes
No. Jello contains gelatin.
Yes. People on Gluten Free Diets can eat Jello.
yes
you eat it
Yes
Jello is not bad for you. Its not bad for you but is one of the better desserts to eat.
yess
As dried crystals its not Perishable. As ready to eat Jello then yes (as it has a limited shelf life)
Firstly, Jello is not a natural food, so elephants would never encounter it in the wild. Secondly, Jello is made from gelatin, which comes from bones and connective tissue of animals. Elephants are strict herbivores, so they would not be able to safely eat Jello.
no