Give her a chance. If person says she have feelings for you its not necessary to let her down straight away. Go on a date or two and if you dont like her then stop. Now you cant say direct that you dont feel anything cause she will get hurt. Better say"You have potential but I still have to get know you better, you cought me offguard by saying you like me." Something like that, say thanks but this came unexpected, maybe we can hang out some time in future.
Doubt kills more dreams than failure ever will