DC9's ex best friend, who I refer to as Lily here, not her real name, has in the last 2 years turned frenemy and DC's feelings over the lockdown have become more negative about it, and she doesn't want to go back to school because of it.
Over the last year, Lily has been either nice to DC's face but very mocking about DC behind her back, turning others against DC if she can, playing tricks such as asking DC to play with her in a particular place in the playground and then getting a group to mock DC there (DC calls it "the bullying place"),or she is rude to DC directly but pretends to the teachers that she isn't, for example putting only her middle finger up at DC but putting it against her nose and so that only DC can see, and she then says she was just scratching her nose. On a couple of occasions it has got physical - for example, Lily held DC while getting a boy to kick DC, Lily then said to the teacher it wasn't meant the way DC took it and Lily said she was really sorry and the teacher took this at face value but told the boy off. Lily regularly bullies about 4 other children too, according to DC it goes in cycles.
Lily has a new best friend. DC wants to play with other children but quite often when she does Lily comes and wants to join in or be mean.
The teacher's stance is slightly affected by Lily's past. Lily was sexually abused by someone who was not an immediate family member for 2 years and has been seeing a psychologist, and the teacher knows the family personally. Lily's mother is very sure of herself, she will often give advice to other parents about their parenting and she expects very high standards from Lily in terms of school work and independence and "popularity" and so Lily is under a lot of pressure.
DC does well at school and is generally popular at an "average" level, so the children are usually pleased to see her, but they all tease each other and fall out from time to time. It is different with Lily, DC feels she cannot compete with Lily as Lily is "in control of everyone" as DC puts it. DC was heartbroken when they stopped being friends and has only properly realised the extent of the two faced behaved recently and DC is now really angry about it, and in the weeks before lockdown had become increasingly rude to Lily, which did not help.
I have tried talking to DC about it, about her feelings, how to handle particular situations, nothing is working so far.
AIBU to ask for any brilliant insights or strategies I could suggest to DC while on lockdown to help them feel more positive about school, and deal with it better when they all go back?