<human>: Condense the text into a few key points

Hi /r/relationships. I'll keep this short and sweet.

Being it's winter break, I've been hanging out with my family a lot. Last night we were all over my aunts house, when my cousin(I'll call her stacy) handed me her phone to show me a picture of her dog. I went back to her main photo library to go back to the camera section so I could take a picture of me making a silly face just to annoy her, when I noticed two pictures that caught my eye. 

It was just your run of the mill dressing room selfie, of Stacy in two different bras. (I'm pretty sure she was wearing jeans in the pic)

The pictures themselves weren't overtly sexual, so I'm not particularly worried that she's sending them in that context. I wouldn't assume she sent them anywhere, except they *do* kinda seem like the type of picture you would send to your girlfriends to show off new clothes you bought.  

The age of consent in our state is 17, so she falls just short of that.

As for our relationship- we're both only children, but we've grown up together. We have an extremely close relationship, but not necessarily a *personal* one. I would like her to know that I'm here for her with any issues she might have, but I don't want to come off as accusing or embarrass her, especially if I'm making this out to be more of a big deal than it is. For all I know, she hasn't sent those pictures to anyone, and only took them for herself.
<bot>: I found (non-sexual) underwear pictures on my 16 y/o cousins phone. Should I bother bringing this up to her? If so, how should I approach it?