Sorry Dakota,
I guess I missed your post. Actually my excuse is that I was already reading the thread and posted my response before I saw yours.
I understand what you're are saying about calling the runner out between 1st and 2nd, but once she returns to 1st and then takes off again hasn't she now
"passed the base she would have reached if there had been no obstruction"?.
I would agree with you if the runner continued on to second after the obstruction, but once she returns to her "protected to" base, I think that the effects of the obstruction have been nullified and once she leaves 1st again, she is now running at her own peril per rule 8.6.B(2).
That's my interpretation anyway. Subject to change via persuasive argument.
SamC