Question about friend/coworker

Lisabet
So. I work at a day care and I made really good friends with my coworker. I made her my maid  aof honor. 
Anyways, at work, she doesn't change diapers as much as I feel needed. Then I always end up having to change really full diapers, which I don't mind, I'm just looking out for the kids.
So my question is, should I tell my boss or should I talk to her about it? 
I'm worried if I tell my boss and it gets around that I told, she'll get butt hurt and won't want to do my wedding let alone be my friend (my brain tells me things that aren't usually true.)
Please help, thanks! :)