FIGHT ME.

Wow! Okay, :D Buying a tablet. Well, depending on alot of factors, it can be different for anyone. For example, will she use it alot? a frequent artist? tech savvy(maybe not so much this, tablets are easy to use)? If it’s their first tablet, some people buy a cheaper beginners tablet, just to figure out if it’s something they can see themselves doing without buying the professional (expensive) piece of equipment.
Of course, if she is constantly drawing on it, getting better, needing more room, you will eventually have to get her a nicer tablet. ;> 

I myself, wanted a nice tablet from the start because i knew i would probably use it every day. and i have. :D and it has lasted me a good, year and a half? I’m sure it’s going to stay with me for quite a few more years.

On brand! i recommenced Wacom
It’s the brand of one i have. Good quality and their pretty well known for their tablets. :D 
I believe they have two lines of different tablets.

The Intuos5,(from what i’ve read,) is a professional tablet and the only difference between them is their size. The smallest one is more expensive than mine!(though the XL is much different but i don’t think you’re going to want that one)

The Bamboo collection is more of, the larger it is, the nicer it is. Baaassiclyy,
Bamboo Connect: Small easy little thing that will get the job of a tablet done. probably more for super quick sketches or something to jot ideas down. 
Bamboo Splash: Definitely more for the beginner artist/first time tablet user. i recommenced this one, if you’re going to start out small. :D
Bamboo Capture: Right in the middle between very nice, and beginner. better touch sense and smoother, larger surface.
Bamboo Create: The one i have! I am extremely happy with it and it’s pretty much, better touch sense and smoother, larger surface than the Capture.

Of course you don’t have to buy from Wacom, there are alot of different brands out there with the pretty much same basis of the it though. Some are much nicer and expensive, some are much cheaper that don’t last long. 

So i hope you don’t mind me publishing this in case someone could use my lame help. i feel like a salesperson. I also have no idea what i’m doing so you should probably ask some more experienced artists too. ; u ; Hope it helps!

Edit: The Wacom website has changed it’s interface along with new designs of all their tablets.