Take your time and do an an activity that tends to lead to clear thinking for you. Drawing. Yoga. Running. Etc.

It really isn’t a big deal if you do have feelings for her. It’s something that happens between friends at times in life. The important thing is you don’t let it corrupt the relationship you have cultivated thus far. Clear communication is the best way to prevent this.

It’s very difficult to tell from a one sided perspective of a single moment, but I would guess that she has some level of feelings for you too. Talk it out and don’t rush things.