Blogger Advice Needed: what to do when they steal your images?

Someone took my blog's header and used it in a blog post. She didn't even change the name of the image when she uploaded it to her blog.

This person didn't contact me to ask permission and is not giving me credit on her blog post.

 

What do I do?

I took a screen shot of her post.

I have a right to ask her to remove the image from her blog, right?

 

Should I email this person or leave a comment on her blog post asking to remove the image?

 

:/

 

*update: sent this person the email. hope she understands and it's solved peacefully.

*2nd update: found another person using my blog header in all of her social media accounts. Sent her a message too. Now I wait.