My guess — guess — is that there was some problem with the microphone they were using to record her dialogue, maybe a short or a blown connection in the boom mic, and they either didn’t notice or didn’t care and left it to the sound editors to resolve. It seems quite common in the latter half of the series: Maggie attacking a bar patron in “Breeder” had no sound effects, Robert Floyd was inexplicably not tasked with recording Quinn’s “Go, go!” in “Unstuck Man.”
Another thing about the Sci-Fi years that irks me: any time we see a closeup of an object like Wade’s necklace in “Genesis,” it’s in a frame-skipping, choppy shot as though they failed to leave the camera running for the full duration needed and had to slow it down to have it onscreen for longer.