Where has sleep gone!!!

Please tell me I’m not alone we have refusal to nap an refusal to sleep at night our small family Xmas has been pretty much 1 person downstairs watching as tv and then swapping to be with our Lo who just won’t sleep We are all exhausted and it’s a nightmare as she will sleep from around 4am until 8am Then the day starts an we are all trying to deal With nap times of 2 until 3 then it’s a fight to get her to sleep before 10pm She doesn’t nap she crashes at 6 but then is up ready to go at 10 Please tell me any tips! We have tried sleep training and it didn’t work an I mean every time we left the room she would end up vommitting she got herself so upset an o can’t put her through that! No dummy a never had one has 7 teddys 3 nightlights same bedtime routine all calm but she won’t give up and we then end up having a very over tired naughty little one with attitude!