I'm not an expert on step sequences at all but I was curious too so I just spent half an hour examining her steps at half speed

I think she missed the 'two different combinations of 3 difficult turns on different feet' feature; her first attempt is LBI counter - LFI counter - LBI rocker (
https://www.youtube.com/watch?v=W6vtj_Wl9_0 at 4:00), but it looks like she changes edge before the rocker, turning it into an LBO three turn instead (changes of edge and three turns are both not allowed). Her next combination is RFO twizzle - RBI rocker - RFI rocker (at 4:19), which looks fine to me so I guess the first attempt/change of edge did get called. Or it's a different reason entirely, in which case feel free to correct me