The launchers that the dude has recommended are viable replacements for the stock launcher that comes with the phone - that is the best thing about android - you can customize it as you please - if you download and replace the stock launchers with either one of the ones mentioned here or some others, you will have the option of being able to edit the homescreens as you please and delete the homescreens that you do not want - there isnt much complication to it so i am sure your mom will have no trouble with it as long as you download the launchers etc - besides if you dont like the replacements, you can always uninstall them and you'll be back at the stock launcher -
Each launcher has its own advantages etc and you can read about what each launcher offers in the description for it when you go to download them from the google play store -