Unplug the cable and when she complains it doesn't work, suggest that you two go out and do something fun instead of sitting around inside.
We eliminated paying for cable but still get local basic cable since we get cable internet. So all the unscrambled channels still come through, maybe 30-40 analog and digital channels. Everything else we get from the internet, amazon prime, pbs kids, etc. That cut our cable/internet/phone bill from $180/month to $80/month, and we haven't missed a thing.
And we get out of the house or do other things instead of sitting in front of the tv. That's more valuable than the $100/month we're saving.