Hi there - it looks like your space upgrade was purchased for the site thedogwalkinggardener.wordpress.com - not mylifeisreallyinthegarden.wordpress.com.
Would you mind double-checking on which site were you seeing the warning about running out of space?
Also, can I clear away (delete or store?) photos that I've posted from a few years ago ... to increase my space for future photos??)
You can delete photos through the Media Library - here are some instructions.