Dogs generally dont like the smell of citronella.
DONT put it directly on your lounge, but mabe put a few drops on some old pillowsand leave them on the lounge. Just dont let any get on the leather.
You may want to try a leather conditioner/cream, that should probably dull the marks but may not remove them all together. Just be aware that most of them are oil based so be careful about sitting on the couch straight away in your fave pants.
She has probably dug into it to make it nice and comfy - like the old couch LOL
Just be aware that most dogs lurve to chew leather too, so if she gets a nibble going on, remove her teeth