I didn't know Mackenzie but followed her story online, and I think of her wherever I see pink.
Mackenzie's cheerfulness was a reflection of the hard work her loved ones put in to protect the mood around her. I admire the tenacious commitment of her loved ones to maintain that positive atmosphere. Its far from easy to do that, to give that gift, while living through your own grief. You put your pain aside, making the conscious effort to cocoon her in only love and protect her from pain in any way possible. You gave her such a special life.
I know that you will be okay in this next chapter of life because you're surrounded by each other, each selfless being cared for by another.