The dictionary has 24 explanations of change as both a noun and a verb, but it can generally be defined as "to make different in some particular". Maybe Martha Stewart didn't specifically have change in mind when she uttered her infamous line, "It's a good thing.", but the following great minds do offer some insight into the nature of change.
"Change alone is unchanging." - Heraclitus
"Change begets change. Nothing propagates so fast." - Charles Dickens
"There is nothing wrong with change if it is in the right direction. To improve is to change. To be perfect is to have changed often." - Winston Churchill
"It is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be..." - Isaac Asimov
Change is complex, scary, hopeful. I don't know why Mrs. Peeps is thinking about it so much, but perhaps all will be revealed in the fullness of time.
Me, I'm not so comfortable with change unless it is changing my nap location.