I wouldn't presume to argue against her, because she's a physicist and I'm not.
I'm mostly making the case to the peanut gallery here to maintain a state of epistemic noncommittal. It's a very popular intuition to think that "dark matter" is just a weird consequence of modeling things improperly, kind of like how we used to think there was another planet between Mercury and the sun because that was the only way to make Mercury's orbit consistent with Newtonian dynamics. If we are modeling things improperly, I suspect it would have to be a pretty weird bug--and I think the one she's suggesting qualifies as such.
I'm mostly making the case to the peanut gallery here to maintain a state of epistemic noncommittal. It's a very popular intuition to think that "dark matter" is just a weird consequence of modeling things improperly, kind of like how we used to think there was another planet between Mercury and the sun because that was the only way to make Mercury's orbit consistent with Newtonian dynamics. If we are modeling things improperly, I suspect it would have to be a pretty weird bug--and I think the one she's suggesting qualifies as such.