Toilet Paper Generosity

Last night we heard Madalyn yell that she needed toilet paper. I asked Amelia to take her a roll. Amelia comes back to the couch and I ask her if she took her some toilet paper. She said "yes, I took her 4 squares". I asked her why she only took her 4 squares. "Because she only uses 3 squares" was her response. Makes perfect sense to me!