Based on what you have said today, I have serious concern that this matter is being, or will be, dealt with in a manner that will reassure your dd and yourself/wider family that it is being taken seriously and I give apologies in advance for what is likely to be a long response.
Are you aware of the specific offence(s) the young perpetrator has been charged with?
I would hope that he has been charged with an offence or offences under the Protection from Harassment Act 1997 as amended such as causing alarm or distress under Section 2 and/or putting people in fear of violence under Section 4.
I would also hope that his partner in crime co-offender has been similarly charged or has been charged with aiding and abetting. While it may not be 'in the public interest' for this young person to be prosecuted, it is my belief that it is very much in the public interest for the institigator of serious threats against your dd's life to be dealt with by the Youth Courts as this will send a message to his peers that such behaviour will not be tolerated.
You have said that you 'probably won't hear anything further' but this should not be the case. The police should call a MARAC (multi-agency risk assessment conference) to share information with agencies such as SS, the LEA, and others that may have professional involvement with this boy/his parents, with a view to constructing and implementing a risk management plan to provide professional support to all of those at risk and who may be at risk of repeat victimisation - and I would remind you that you, too, have been subjected to harassment.
This lad may well have had a 'massive fright' when the police fetched up on his doorstep, but bitter experience leads me to believe that such fear is temporary at best and may subsequently give rise to a certain swagger when he is recounting his experiences at the hands of the boys & girls in blue to his peers.
His behaviour has been attention-seeking in the extreme and, make no mistake, he will now be on the receiving end of the attention he craves from 'understanding' adults who won't be 'furious' with him. It may be said that he will be treated with kid gloves while his victim is left out in the cold and marginalised to a point where she may wonder if she is at fault.
The fact that you've said he has 'asked to be moved from the class he has with dd' gives cause for concern that he will be able to resume his education at your dd's school and that it may be that others will, for want of a better term, 'fight his cause' in a more subtle manner to the continued detriment of her emotional wellbeing.
Under the circumstances I would urge you to seek a restraining order on behalf of your dd which will prohibit her aggressor from:
either alone or by means of agents) to directly or indirectly contact, harass, alarm, or distress the victim and others as appropriate;
not to knowingly approach within the boundary of specified streets/roads any premises where the victim and others as appropriate reside, work or frequent;
not to telephone, fax, communicate by letter, text, electronic mail or internet with the victim and others as appropriate, or to send or solicit any correspondence whatsoever;
not to display any material relating to the victim on social networking sites including YouTube, Facebook and Twitter;
not to retain, record or research by any means, private, confidential or personal facts, or information relating to the victim and others as appropriate
If such an order is granted, your dd will be able to continue her education at her current school without fear of encountering her aggressor. If no order is in place and the LEA choose not to permanently exclude this particular pupil, my fear is that you/she may be looking at the need for her to change schoools.
To this end, you may find the following agencies of help:
National Stalking Helpline www.stalkinghelpline.org tel 0300 63pro6 0300
www.protectionagainststalking.org which works with relevant agencies (such as police, SS, LEAs etc) to ensure victims receive aall the protection and help they need to live free of fear
The network for surviving stalking www.nss.org.uk which was established by a victim
And finally the Corom Childrens Legal Centre may be a source of free legal advice www.childrenslegalcentre.com albeit, in common with her agressor, your daughter should be entitled to legal aid if you seek a consultation with a solicitor.
I would add that www.rightsofwomen.org.uk is also a valuable resource for females young and old.
Many victims have placed their faith in the police only to be disappointed. I hope you will take steps to ensure that your dd won't be disappointed by the eventual outcome of this matter.
FTR, I don't always take such a hardline against young offenders but in this instance the extreme nature of the threats against your dd have given rise to my serious fear for her emotional wellbeing and for her safety. She needs to know that if she hadn't had the misfortune to become involved with him, he would have alighted on another victim and another young girl and her family would be undergoing what you are going through now.
Congratulations at getting to the end of this marathon post. I hope it will be of help to you.