I have my reasons for not sharing pictures of my DC online. One huge one is I have a unique, tape it into google you get me name. My twitter, my website, my work the lot. The other is DCs dad is not around and I don't trust him for many reasons I wont go into here inc a DV incident.
I explicitly said to everyone at a recent party no pictures of DC to be put online. I am happy for DC to be cut out or blurred out of pictures but no full photos that are recognisable. Everyone but my sister followed my rule. Other siblings put emoji faces over DCs face and hair before uploading them. I'm fine with that. most of them avoided DC in the pics to begin with.
She posted publicly 15 images of my DC that were easily recognisable. not edited or blurred out.
I requested that she take them off. She refused.
Of course I was angry and was rude about her complete disregard for my one and only rule about DC and told her she was being an idiot for putting DCs safety at risk.
She's made this all about her and how I'm spoiling her life and that I clearly don't want to be part of her family.
In my anger I said yes, you're right I don't want to be if you cannot respect my desire to keep my DC safe.
As you can imagine there is now a massive fallout and I'm getting the brunt of the abuse because 'its only a few pictures' - shared amongst her 400 friends some of whom are friends with DCs dad. my gran has weighed in and told me not to be so dramatic. 
She has also in the past used images of my DC to help promote her business. On that occasion I was polite and demanded she remove those images. Again she refused. I actually had to go via FB to get them to delete the photos and it took forever. I warned her that if she continued to use pictures of DC to promote her business without permission I would go the legal route.
Is there anything else I can do to stop this?
every flippin family event she is there taking photos and its getting to the point where Im not going to them because she wont respect my rules.
She tried to say it was no different to me bringing sweets to a halloween party last week because I bought sweets her kids are banned from eating and I didn't respect her rules I didn't give them to her kids but brought them along as an addition to the party food and I didn't know her they are banned (she's gone veggie and her kids aren't allowed gelatin) The food wasn't all veggie btw.
Even I don't post pictures of my own DC online because of the reasons above. My online life it looks like I am childless and that's how I prefer it to be for DCs benefit not mine. I don't even post my siblings kids online. I send them to them via private message or text and have a few I've printed to go in albums but that's it.