It is very possible. It was just right before she choose the shape was....weird...it makes me nervous because we saw with centipeedle that they started to lose themselves or the healing when they became upset. Low self esteem isn't too far off from being upset and feeling worthless...plus...Amythest was technically on Earth when the Diamonds did what they did so it has always worried me. Even when I thought they were made to be that way.
Was I the only one that noticed Amythest almost went corrupted for a second? Just before she choose her normal form, it glitches for a second....she was born after the war so it would make since that she was effected slightly too when being made....I was really hoping my theory on that was wrong but I think I was right :( the earth around Amythest might have dulled the effects but I think corruption can still get to Amythest....