Not textbooks, no. Novels, poetry collections. Some of her texts are historical literature, as in dating from 17th century etc not historical fiction
This is actually my field. There are multiple digital databases full of these texts (which in context might be described as textbook).
For historical literature, and other research resources, there are many brilliant databases delivered by
- Proquest (eg 19C Periidocals)
- Adam Matthews (for example their Eighteenth Century Stage -includes a whole lot of facsimile manuscripts only available in the flesh in California)
- Gale Cengage (includes most of the entire British Library Newspapers collection)
- Early English Books Online (EEBO)
- Records of Early English Drama (REED)
- Cambridge Core (Cambridge University Press - huge catalogue of primary and secondary sources)
- Oxford Scholarship online - huge catalogue of primary and secondary sources (Oxford University Press)
- EBSCO
- JStor
- Project Muse
All of these (and more, this is just off the top of my head) contain primary sources - fiction, poetry, drama - as well as secondary litcrit materials - books and journal articles.
Then there are the free online collection. For example:
- archive.org
- Project Gutenberg
- Google books
I use all of these resources all the time, even when we’re not in lockdown. I’m using them at the moment to finish a book on the 18th century (on the one day of the weekend I get free).
I use these resources to teach, all the time, as a supplement to our Rare Books Library. I introduce my first years to them, and by 3rd year, I expect my students to be familiar with them and know how to use them. This was a standard part of my teaching, and part of teaching students research skills and methods as they move through their degree, before lockdown.
If your daughter’s university is a decent place with research-intensive provision, they should have these (and more) and she should have started using them in her first year as a matter of course. Although if she’s at a post-92, they may not have them, as they’re often not funded so well for research in the humanities, and students generally aren’t as focused on research.