R3 scores and run counts. Since she didn't slide, Int on a retired player and R2 is out at 3rd since she becomes the closest BR to home. Inning ends since R2 is the third out.
I completely agree with YOCOACH. R3 should have slid to avoid collision. Because she did not, INT is correct call. Run counts, 3 outs, inning over. ASA Rule 7.J.2.