Maybe she does not own the mansions in which she lives.
Who does? It appears she does own one in California, which apparently isn’t even in her district. I’m thinking there’s probably a rule agains that sort of thing, but it is California, she’s Democrat, she’s in Congress and a reliable vote for the party no matter how ridiculous or destructive the bill is, she’s an admitted socialist even though she probably can’t spell the word...so, the rules don’t apply to her.
Also, I would think there would be some type of ethics rule that would prevent her from doing that, but...see above. Hell, Barney Frank’s boyfriend ran a gay escort service out of his home and nothing was done about that, because the Congressman said he didn’t know anything about it.