I agree that a portion of the rule states that runner cannot be put out between
the two bases that the obstruction ocurred. However, in this case though technically
she is betwix two base, [runners will always be between two bases unless they have just
crossed home plate]

She is at 1st base not even considering going to 2nd
until the throw gets by F3. So now another rule comes into play. Rule 8 Sec. 6.B. 2.
Tells us if the obstructed runner is put out passing the base
which would have been reached, in our case FIRST, had there not been obstruction,
the obstructed runner will be called out. Ball remains live. I can understand
it if batter hits ball to outfield and on a close play at 2B she is thrown out after being
OBSD by F4 or if she hits a gapper, is OBSD at 2B by F6 and is tossed at the 3rd. These R's had
opportunities to advance, R1 in our case did not, she was merely trying to regain 1B, did, then
on overthrown ball tried for another base. Make sense??
glen