OPPOOL
I still think that you have interferrence - as defined 8.6.17. Thus dead ball, and B1 returned to 1B. But someone has to be called out; if it can not be R1 (because she has scored), then it has to be B1 (who is closest to home plate). Same result, run scores and now 2 outs.
Note that if you determined that R1 intentionally interfered, then "the umpire has authority to declare two runners out." Casebook 8.6.17. Now you do have your inning ending double play.
WMB
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