If it's only her face, and nobody else's, and the rest of the picture looks fine, then it's almost certainly some form of post-processing by ABC. Either way, it's extremely unlikely to be a Comcast issue, but is with either ABC or your local broadcaster.
A few months ago, here in Chicago, "Roger Ebert Present At The Movies" had a similar issue with faces on a few shows that aired on WTTW (PBS). It wasn't just on Comcast, as antenna users were also complaining.
Back in the analog days, this softening was actually common. You just look for flesh-tones, and soften the video in that area.