I would recommend just buying a couple of books to start out with so she isn't overwhelmed to read a lot right away? And, some fun items too (I mean, books are fun but hopefully you know what I mean xD) Sadly, I do not have any I recommend at this time that stand out to me personally.
How thoughtful of you to enquire about items for her. I wish ya'll many happy times and to try to laugh during the hard seasons or when one of you is being a butt head :P
My personal opinion on essentials if ya'll are just starting out:
I would get her a tarot deck (I am in love with this one) https://www.amazon.com/dp/0738751391?psc=1&ref=ppx_yo2ov_dt_b_product_details
And something for spells:https://www.amazon.com/dp/B01N1UI47I?psc=1&ref=ppx_yo2ov_dt_b_product_details (this is the best stuff I ever ever smelled!!)
Herbs from the grocery (link not included :P)
You have to have a cauldron! https://www.amazon.com/dp/B08JPG1ZPD?psc=1&ref=ppx_yo2ov_dt_b_product_details
protection https://www.amazon.com/dp/B09LLQ34Q5?psc=1&ref=ppx_yo2ov_dt_b_product_details
And lastly something for witchy ambience https://www.amazon.com/dp/B08HVKHTGF?ref=ppx_yo2ov_dt_b_product_details&th=1
One of my favorite witches on the internet:
https://www.youtube.com/watch?v=VpFcggluGTg
Wishing you a happy journey