I also wonder how much the others are actually "complaining" about the jokes, unless she's making a massive disruptive production every time. This really does sound like a BEC situation (by which I mean, LW is BEC about coworker and coworker is BEC about the broken climate control.) If there's widespread agreement in the office that the bathroom is too cold, this may not even be so much a "repeated joke" as "what I am saying instead of cussing out management".

(Source: I work in a building where people do have to keep blankets, scarves and gloves on hand if they have to work in certain rooms in the summer.)