Add an automation for Alexa to scream all over the house when left on outside the schedule. It’ll reeducate everyone to turn the lights off when done 😉

Now seriously: you could use another automation to turn it off after some time. Or improve it with presence/motion sensors to turn it off when no-one’s around.

Finally, if you really want to let her control the lights, I guess you could expose those to a “new virtual” house and invite her to that house. I’m not sure how it could be done in Alexa, though.