Yeah, Oly squat technique is markedly different from PL or general strength style squatting, so she may be correct. For Oly work, you want the torso as vertical as possible because this means you are in better position to catch the weight.
It's hard to understand, but a starting point may be this: get a moderately heavy dumbbell and hold it in front of you, then do a goblet squat, making sure to keep your chest up and high. Sit in the bottom and notice the position you're in. When you come up the chest stays absolutely high.
I haven't seen you so I dunno if this will help or not.