FFS! I thought we’d seen the last of those bloodsucking little feckers a decade ago!
Am additionally annoyed because it’s due to her dad’s girlfriend not bothering to de-louse her kid before they all went on holiday together. 
Do any of the shop-bought things work? When she was at primary, I used to comb through with conditioner and the nitty gritty comb every Sunday and that got rid, but it’s not doing the trick this time. Are they still resistant to everything on the market, or is there some miracle cure that’s come on the market in those blissfully louseless years?
Help me please! 🙏