On our recent family visit to her house, SIL set up a video for all the kids using our Netflix streaming, and thus learned our account password. Now I've been seeing by the "Recently Watched" section in our account that she is continuing to use our Netflix account to show her kid videos, without having even asked us about it. It's not interfering with our ability to use our Netflix account, but it's rubbing me the wrong way, partly because it's cheating, partly because she didn't ask, and partly because it's another sign of how cheap she is. (Also I'm not sure I like the idea of her seeing what videos I watch, although I guess that's not a big deal -- I'm not watching pornos or anything!

) I'm considering just changing the password without saying anything to anyone (like DH), but we have a vexed history and she'll know that I did it deliberately to close her out. Of course, there's an outside chance that she'd bring it up and ask for access to the account, now that she's got the idea in her head. Should I just let it go? Change the password because it's the right thing to do? Tell her, if she asks to share, that we can't share, and what reason to give that doesn't open the door for resentment? WWYD?