Can you lock whole conversations on an iPhone?

My mother can be very nosy and I don't want her looking at my personal text messages. I already have a 4 digit lock code to get into my phone, but that doesn't stop her. Plus, if I ask her not to look, she will look anyway just because I say not too. Please, please tell me there's a way to lock individual whole conversations without having to delete them?

I think there's an app for that

Nope, the only thing I can think would be to download a texting app and hopefully that app can lock them

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