Hi everyone, I (M 18) going to a lunch everyday next to our school and there is an older woman (late 30s my guess) always having eye contact with each other. We have a cards to beep so that the system knows we got the lunch. She is watching if we did beep or not. In the last days we always had big eye contact and both of us are smilling at each other, she complimented me few days ago that i always smile. Is she just polite or does she like me? What do you guys think?

Edit - I had two girlfriends before, they were my age and which gave me obvious signs, but in this situation i am confused also do you have any tips on women these ages?