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Sorry if I was not clear. The donk is +1 and the TAG is MP3.

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Changes my answer.

What is in the TAG's coldcalling range?? AQs is the only thing that seems reasonable to me. Also, is TAG aware of the idiocy of UTG+1?

I still don't think you'll get caught in a raising war here on the river. There's a good chance you are ahead of TAG, even if she does manage to raise. There aren't many hands she'll play for the straight, and her pocket pairs probably would have raised or folded preflop.

River is a tight spot. UTG+1 is donkbetting every street. Big hand? Or big draw? Maybe I do call here after all.