Alternatively it could have been a way to determine the right memory charm to achieve the desired effect without using legilimency
The Potions Master was frowning thoughtfully, eyes intent. “The reaction to a False Memory Charm is hard to predict in advance, Mr. Potter, without Legilimency. The subjects do not always act as expected, when they first remember the false memories. It would have been a risky ploy. But I suppose that is one way Professor Quirrell could have done it.”.
Like how in the GHD iteration we saw, she revealed that she was susceptible to believing that Snape is a Death Eater, and that it’d be hard to convince her that Harry would betray her.
And, in fact, she was led to believe bad things about Snape, but not Harry:
She has been thinking of how Mr. Malfoy might be in league with Professor Snape, how he might be planning to harm her and harm Harry—imagining it for hours every day
Alternatively it could have been a way to determine the right memory charm to achieve the desired effect without using legilimency
The Potions Master was frowning thoughtfully, eyes intent. “The reaction to a False Memory Charm is hard to predict in advance, Mr. Potter, without Legilimency. The subjects do not always act as expected, when they first remember the false memories. It would have been a risky ploy. But I suppose that is one way Professor Quirrell could have done it.”.
Like how in the GHD iteration we saw, she revealed that she was susceptible to believing that Snape is a Death Eater, and that it’d be hard to convince her that Harry would betray her. And, in fact, she was led to believe bad things about Snape, but not Harry:
(Dumbledore in Ch79)