I think the only solution for you would be to buy her a new PC, or better yet, a laptop, since it is much more suitable for studying. I recently bought myself a DELL G15 5510 laptop
https://www.moyo.ua/ua/noutbuk_dell_g15_5510_g15558s3ndl-60g_/522615.html . It's a great laptop. It is quite inexpensive. And it perfectly performs all its functions. Very good graphics card and processor. It has built-in cooling system.
I compared many models in this price range, I couldn't find a better one.