If we only had enough money

Alley continues to ask if we can go on another plane ride - and just doesn't understand why we can't everyday. So after the many "Why"s from her - I said that it is expensive to take plan trips and we need to save up money. That seemed to satisfy her for the moment - but then a few days later she told her teacher that we don't have enough money to take a trip on a plane and she started asking if we have saved enough money. Then she said that she has enough money - she went to the store and got some for us.