I've been accused of using Zebra and now I'm having a difference with that player. I'de like to know your opinions.

The point is that she used zebra to check on me. Now, can this be considered as using AI aid in a game? Ofcourse, only previous played moves have been evaluated by zebra. But it's not unlikely that previous moves/patterns still are there on the board! That's actually very likely. I think analysing previous moves in an ongoing game certainly gives an advantage. So, the question is: when a player analyses previous positions with zebra, can that be considered as a form of cheating? Opinions, please.