You know, she says they're lies later, but saying things that other people actually mean when they say them, and which the target believes people really think about them would be a terrible idea and make people question if you are lying most of the time, and just using April Fools as an excuse to tell the truth...

It works better when you just go pure opposites, like "I hate you. I hate the way you always look out for me, I only like when you look away at your nee-sama."