(I need your opinion) i M23 saw my cousin F19 naked and i think she not feel uncomforted about this

(Im not feel atracted to her . We grow up together and we r first friends of each other of course i saw her befire naked but that time we just kiddos . When holidays come all family meet at grandmas house .Because of our closeness we stay at same room . And its never being a problem since now ). Return to that day. I casually enter our room and she is bare there clasping her bra on and bottom is fully naked ( i just see her from side not full view) . We just stare each other and i leave in silent. Now she act like it never happend and i feel weirdly cold about our relation with her . Am i normal ?. Pls light me up with your opinions .

""" Sorry for bad language its not my native""""