I would say go with your gut and initially you said you were in an okay place so don't jump to it being a not so good place! Believe that you guys are in a good place and liking her post was good and made her smile maybe. I would always try to switch the feeling and turn it into a positive!! There was no harm in liking her post unless you THINK that if not, believe that it was okay and that you guys are in a good place not even just an okay place!