I think it should be 'demanded from her'. Also, if 'she' is a writer, not a heroine of a novel, the adjective 'literary' sounds weird to me.
I think literary (= connected with literature) is OK here.
In UK usage demanded of is OK as here because such use is common when related to something requiring a particular effort.
Alternative usage in a different sentence structure might be 'public appearances placed a heavy demand on her time'. Also demanding (= requiring skill/effort) as in 'she found public appearances demanding and quickly tired during them'.
We would use demand Ö from if wanting something more tangible, eg 'I demanded an apology from the company'.