Careful...
If it was "the fielder's presence in the basepath" that caused the runner's reaction, and the fielder did not have the ball, you do, indeed, have obstruction.
The poster described, however, that the runner saw that the fielder was about to receive the ball. This tells me that the runner's reaction was not to the fielder's presence in the basepath, but to the likelihood of her being tagged out if she continued. This is NOT obstruction.
Yes - this means that we have to use judgement to determine the runner's reasons for altering her course. "Oh, no, she's in my way, I have to get around her..." is obstruction. "Oh, no, if I keep going forward, they are going to tag me" is NOT obstruction.
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