Most Helpful Girl
Not sure there's kind of a lot of options. She could be on her period, but people over-exaggerate a girl on her period because most of the time its not so serious that she's going to take out her anger or frustration on you. She could be tired, lazy or having personal problems or family or friend issues. I doubt she isn't interested in you, she may not be, but if she wasn't I don't think she would have put so much interest in you before. Just give her some time and some space. If she doesn't say anything for more than a week than she might not be interested, but no worries! there's a lot more girls out there, she isn't the only one.