The most authentic "blog post" content regarding this song comes directly from Jane’s own reflections and posthumous releases:
Jane wrote this song as a metaphor for being . She felt figuratively placed in a bubble, separated from the rest of the world by her diagnosis. Nightbirde Girl In A Bubble
According to the Nightbirde Foundation , everything she did after writing that song was a "fight to get out of that bubble" and reclaim her joy. Where to Read Her Writing The most authentic "blog post" content regarding this
If you are looking for a deep dive into the meaning behind it, here are the core themes and the best official places to read more: The Story Behind the "Bubble" Nightbirde Girl In A Bubble