I would advise your daughter to see a good orthodontist who will likely recommend braces and then jaw surgery. They also need to do panoramic X-rays to look at her full jaw, teeth and jaw joints.
Don't just leave it.
My parents did nothing to correct my awful underbite, deviated jaw and crowded/crooked teeth (although the deformation was obvious and dentists told my mother I needed to see a specialist) and it has such a negative impact on my life...
I was bullied because of it when I was young and ended up with TMJ, limited mouth opening and chronic pain. The issue also affected my breathing and damage my teeth and degeneration of the cartilage in one of my jaw joints.
I had to wear braces and having jaw surgery as an adult which is much more difficult than doing this as a teen...
I am still dealing with some chronic pain.
So please advise your daughter to have this addressed now.
Can you ask your dentist/GP to again refer you to an NHS maxillofacial consultant to get a second opinion?
It is not just the aesthetic aspect, it is the fact that it can lead to other health issues as my story shows.