When Macy knocks the potion onto the router, it starts making electronic noises like a dial-up modem would make. The sound heard is an analog version of digital data, which is how electronic data was able to be sent over telephone lines. Not only does the household have a digital internet connection (which is how she was able to stream a show), but it was the router that was affect, which means any analog connections would have already been converted to digital, meaning that the dial-up modem sounds shouldn't have been heard at all.
Any normal person's reaction to something spilling, is to stand it back up first. Macy's reaction, after seeing the potion spill, is to immediately find something to clean it, even though she's allowing it to continue spilling while she looks.