Was anything other than her nose bleeding? She had over 40 injuries. They couldn't all have happened after she died.
I think by injury the prosecution is counting every single bruise, scratch, scrape etc they could find. That said it's still a lot and the bruising would have happened whilst she was still alive.
I didn't see any mention of bleeding from anywhere other than her nose but she had blood on her blouse and in her hair. Also blood on the toe and sole of the sock that remained on her foot and blood staining on her watch strap
ETA The defence seem to be suggesting that some injuries pre-dated the attack. I'm guessing she may have had a bruise or two and maybe a cat scratch or something but that can't account for many of the stated 43 injuries