Language and style of this normal but well-told love story capture my attention, imagination. On completion of the story, a question popped up. What "mental disorder?" She looked as fine as it can be, but then my knowledge of her condition could be poor.
Dialog and the descriptive tags used in the story made me feel 'here is a sensitive writer'.
" Clenching her fists she opened her mouth, closed her eyes and whispered: “I think I’m in love with you.” As fast as she could.
“What? I didn’t hear you I’m sorry.” He said, peering nervously at her through the covers."

Some of her doubts regarding her brain misleading or leading her on might be common to all those in love. You see some of those emotions ignited by love are common everywhere in the world irrespective of mental disorder.

Enjoyable!

Write on!