Welcome!! Your post painted a perfect picture. I could just see it.
Ditto DylansM's reply. Cats like to scratch on things - for exercise, to sharpen their claws, and to leave their scent (from their pawpads). You'll notice that she'll want a good scratch after she wakes up, to stretch. Who knew, kitty calisthenics.
You can train her to use designated scratching things, like the post, so she'll spare you and your furniture. There are many products out there - hanging ones, free-standing ones, horizontal corrogated cardboard, textures like carpet or sisal rope - and she may not like some of them, so experiment a little if you can.