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GODMODE09
From the other thread, i see you have a Nexus 5 device as phone. So now it is your call whether you want to go with android for tablet as well or go with iOS.
I am pretty sure that since it for your mom, you don't really want to put all custom ROM and all and you are not going to constantly tweak the device. She probably needs a no nonsense device that works for her.
As the forum knows I am biased more towards iOS always, in this case too i would strongly suggets iPad for her.
Mini is a good size and weight at little less than 8". For bigger option, go for iPad 3/4/Air as your budget permits. In fact if it is general browsing, even iPad 1 will work.
Asses the need and then buy, don't just go for latest because everyone says so.
And yes 7" is cumbersome for extended browsing (at least for me). Since i got my iPad, i almost never pickup my laptop for any browsing, unless i need to do lot of stuff.