Sorry, I was talking about the extended Level 3 diploma in Health & Social Care. It is the same amount of study 3 A-levels, so she wouldn't be doing any A-levels with it. She would get three grades where each grade is e.g. Distinction(D) Merit (M) Pass (P)
Or, if she gets average GCSE grades of 6+ she could study 3 A-levels: Psychology, Sociology plus one other.
I don't know anything about mixing A-levels and BTEC courses because none of the schools or colleges in our area offer that.
DS1 has been through the process of looking at university entry requirements, and they mostly offer based on 3 A-levels (e.g. ABB) or a BTEC extended diploma (e.g. D*DD)
If she is considering the possibility of university, she needs to look at some courses and what entry requirements they have, before choosing her sixth form options.