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I dont know why I cant upload a screenshot.but it's in the back of the lake.Where you can collect the one flowers.On the right side look down on the Ground by the bushes it's red. But you could have it on you already.i hope this helps you!

I struggled to get it to appear as well. For me, I started the event with Natalie in the hallway and then the day after in the morning it was clearly visible at the last part of the lake on the right-side of the bushes. I repeat you have to talk to Natalie first and she has to specifically ask to you get the rose for her, don't just go off the hint or you will end up just struggling further. Hope this helps.