L.P.
None of the tablets have monthly fees unless you plan on purchasing a data plan to go online when you don't have access to Wifi. I have an iPhone and use an iPad for work so giving my kids our old phones and iPads has always been our solution. To go out and buy one just for your daughter, I'd go with either Kindle Fire or Nook. I don't really know how extensive the apps are for them but I'm sure there will be lots of things to download for your daughter as she gets older. When you buy electronics though, you can't think any longer than 5 years on the device (even laptops and computers). Technology changes quite a bit over just 2 years so don't buy something that will be great for her in HS. Just enough to cover her for her elementary school years.