Can your iPhone photos be viewed online?

I want to use my sisters phone to take pictures of me and my friends but I don't her to know I'm using it. (I don't have a camera and she hates to share). I'm just gonna use the USB to connect the phone to my computer to get the pictures afterwards, and delete them from her phone.

My question is if after I delete it will she still be able to search online or something through her Verizon or iCloud account to see the photos?

If she's using iCloud, you should delete them from there too. If you don't know how, you go to photos, and then click on the album called photo stream. If you do that she won't find out.