My grandparents had this great chair that I loved to curl up in and read. It was similar to a papasan chair, but it was 60’s modern instead of the traditional rattan. It also swiveled, which was a definite plus.
How about something like these: (I don’t know anything about these specifically, just googled for things that looked like I would want to sit in for hours and read).
https://www.pbteen.com/products/lustre-velvet-dusty-blush-groovy-swivel/?pkey=s~swivel%20chair~105
It also comes in different colors and fabrics.
https://www.pbteen.com/search/results.html?words=swivel%20chair
https://www.pbteen.com/products/sherpa-ivory-lennon-low-swivel-chair/?cm_src=wsipipentry&recstrat=View-View-1%7CWVCB-GRP-AFF-QNT
https://www.pbteen.com/products/sherpa-ivory-lennon-low-swivel-chair/?cm_src=wsipipentry&recstrat=View-View-1%7CWVCB-GRP-AFF-QNT
A couple of miscellaneous thoughts:
While I love to stretch out and read, I’d rather do that in bed or on the couch. I think if I had a chair for reading, I’d probably want it to be a different experience.
Consider what height she’s liable to end up. We always brought furniture to accommodate my 6’ tall husband, and it never fit my 5’2” frame right. The seat was deeper than my thigh was long, so my knee didn’t reach the edge of the seat, which was so uncomfortable I slouched a lot, still didn’t reach the edge, and my legs dangled awkwardly, not reaching the floor. On the other hand, the furniture that would have been comfortable for me would have been completely unworkable for him. As a child, everything’s going to be oversized, but if you want her to use it as an adult, think of what might fit her best then.