Is it rude to leave a flower and a note on the desk of someone you like?

I just brought this someone who is a teacher, flowers and a note saying " hi! Hope these flowers will somehow lessen your stress..sorry I borrowed the vase..have a wonderful day! El-ey" and left it on top of her school desk..if you wonder how'd I get inn to her room..I work as a cleaner to same school.. .but I am so into her, I just love the way she looks at me... .