Adding to grammargran and GSM's posts: she's just been through what felt like an endless round of hustings for this role, most of which were reported verbatim, and some recorded.
She has had ample opportunity to set out what her vision for the country is. She has avoided any discussion of the NHS or social care, I can't recall anything on benefits, or tackling child hunger and poverty, and she consistently said she would not provide direct help with fuel bills (although she is reportedly backtracking on that now).
What she has focused on is the same anti-Europe, anti-immigration (whilst being forced to recruit for the NHS overseas), confected culture war nonsense that has marked her time in various offices.
It could be argued that she was merely feeding the beast to get elected, but her track record does not suggest that is the case. I think there are ample grounds - and evidence for them - for concern and worry.