It sounds like you value your friendship with this person, but you're feeling uncomfortable with the pictures she's been sending you. It's important to express your feelings to your friend, but it's also important to do so in a way that is considerate of her feelings.
One way to approach this situation could be to say something like, Hey, I really appreciate our friendship and I want to support you in any way I can. But I have to be honest, the pictures you've been sending me have been making me a little uncomfortable. I know you're going through some things and I want to be there for you, but I'm not sure if sending pictures is the best way for me to help. Is there another way we can communicate when you're feeling emotional?
By framing the conversation in this way, you're showing your friend that you care about her and her feelings, but you're also setting boundaries for what you're comfortable with. It's important to remember that everyone has different comfort levels and it's okay to express those boundaries. By having an open and honest conversation, you can work together to find a solution that works for both of you.