For drawing I would highly suggest an actual drawing tablet. There are enough out there which fall in the price range or under. Even the good brands.
I went to search for Wacom products, I saw the following:
https://us-store.wacom.com/catalog/pen-tablets/intuosIf you scroll down, you'll see the various tablet sizes and their prices. The Small is just under $100,-, and the Medium is starting to get in the price range you're looking for.
Wacom's customer support is really great, and I would highly suggest buying a tablet directly -if possible- from them. And if your friend keeps the receipt, day of purchase, and anything does go wrong, and it's not her fault but the tablet's (for if it's manufacturer's fault, etc.), then in a lot of cases they'll fix it with no charge and pay for shipping costs too.