An apprentice witch finds out that she's going to die in a year unless she can collect enough tears of pure joy to make herself immortal. It's a heavy premise, a big task, and it's handed to a goofball who kind of can't focus on the task at hand. 

This is really fun. Not perfect, by any stretch of the imagination, but Meg is a fun protagonist and seeing how she builds up relationships with the townspeople and with other witches is really nice. She isn't really sure how she's supposed to finish her task in time, but she wants to help people anyways, and it gives a sort of comfy vibe to the whole story that I enjoy. The tension and suspense is present, but Meg focuses on being hopeful (and absent-minded) rather than dreading her future.

Honestly, if I found out I had a year of good life-span left before it all fades away, I think the way Meg lives it is a good framework. Don't focus too much on the end, but make sure you're able to do good along the way.