DD was in theory borderline for doing A levels (with hindsight it is clear she wouldn't have coped). She also had/has no idea what she wanted to do as a career. But she was quite keen to try Spanish A level. So we went down the mixed route for her, especially as the A level goes well with her travel & tourism BTEC.
I think that with the 3 you are thinking of you could run in to a situation where she doesn't know enough about anything much. (This is just supposition on my part, no data to back it up).
Things to consider:
So does she have aspirations for university? What courses could she get on to with that combination?
If she goes straight to work, is she going to be up against others who know twice as much about a work area as they have done a 2 or 3 A level equivalent BTEC?
On the other hand, it does mean she know about a number of areas, so isn't cutting off any options.
I know there is/used to be a double H&SC A level. Could that be an option instead of the IT BTEC? Though the IT goes well with Graphics perhaps?
Where do you think her interests lie? I think childcare can be an easy go-to option for girls (my DD considered it). But although she likes playing with children, she isn't really all that interested in child development etc. Much more interested in visiting places, languages and history, which is why we steered her towards T&T.
Sorry, a bit muddled. But the A level-BTEC combination is working well for DD at the moment. Not so overwhelmed with coursework assignments, and the A level breaks things up and gives a bit more intellectual challenge.
(The childcare courses we looked at both had a week on week off structure, whereby one week was in the classroom, alternating with one week on placement. Very different from all the other courses).