I presume she’s just done the taster sixth form lessons. They will be entry level, outlining what they will be doing and not indicative of core curriculum teaching.Not all the children trying the lessons will actually go on to do them at A level as they will have been encouraged to try out different subjects. Looking at the school they use EdExcel for A level history so topics wold be:
Russia, 1917–91: from Lenin to Yeltsin,
decline and collapse of the communist East German state, 1949-1990
Protest, agitation and parliamentary reform in Britain, c1780-1928
Coursework: European Witchcraft
Which board has she just done GCSE history with?
She is incorrect if she thinks she won’t be stretched moving to ALevel content and there will be other children starting from GCSE level 8.
One possible issue she may have had was feeling like an outsider as a lot of the children would already attend that school & know each other well. That would obviously change if she joined the school but it may have contributed to her not enjoying being there? It can be nerve wracking to move away from a familiar set up, staff and friends
Regardless if she didn’t get a good vibe it may not suit her and it’s sensible to visit different places, definitely go in person though, reviews are like trip advisor, tend to be a bit skewed.
For waiting lists there can be a lot of shifts in Sept as people change their minds so a place may well become available depending where she is on the waiting list. Hope she gets a place she enjoys.