But one could argue that's exactly what victims of abuse do, deny their abuser did it, change the story, dismiss or play down the incident.
But then on the other hand one could argue it's proof she didn't do it.
Depends what side of the fence you are sitting on doesn't it.
With regards to glass injuries, I've had a few working in hospitality, such as optic bottles smashing in my hand when replacing them, wine glasses exploding in my hand when I've taken them out of the 90 wash and brought them out in to a air conditioned room causing one to explode in my hand with the rapid change in heat. I've also had a glass bottle thrown at me when working behind a bar which exploded on the edge of the bar and sent shards flying everywhere.
The problem with glass is that it doesn't shatter in a uniformed way each time, so the shards are different sized, flying at different speed. Even though the wine glass exploded in my hand, the cut I had on my fingers didn't have any glass inside it, the shard simply sliced through on its journey. I had my finger stitched back up in a and e, and no glass was removed.
So lack of glass in the wound for me, doesn't mean a glass didn't cause it. But that's from my personal experience.