Should I just block her?

This girl I’m talking to added me on Snapchat and keeps talking to me then one day she sent me a nude. I was confused as hell. Anyways turns out she f’n 15. I told her not to talk in that way or send anything like that. I’m 25. She said she talks to me like an older brother but I’m debating weather to block her now or not.
Should I just block her?
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