To spell it out more explicitly, the suggestion is that while currently she’s loyal to Harry because she thinks he’s Harrymort, in the event that Quirrelmort wants to deny Harry influence over her by revealing ‘Actually I’m the one with the Dark Lord in his head, I was just manipulating the boy in a complicated plot, as is my style,’ she still might maintain some loyalty to Harry because manipulated or not, he still broke her out of Azkaban and performed all those impressive feats for her in the process. Especially the fact that he faced down the dementors without a patronus made her think he might actually be coming to care for her even when she thought her rescuer was the dark lord, knowing that it was actually the boy he looked like who did all that for her is likely to inspire some loyalty.
On the other hand, the dark ritual assisted brainwashing she went through was so thorough she was willing to Crucio herself, so the Dark lord might be willing to rely on that to prevent her from obeying Harry instead of stealing from her the memory of what she owes him.
Either way I imagine that the obliviation Harry saw was likely to be fake, after all he would probably want her report on the events that occurred while he was unconscious in case Harry left any details out in his summary.
To spell it out more explicitly, the suggestion is that while currently she’s loyal to Harry because she thinks he’s Harrymort, in the event that Quirrelmort wants to deny Harry influence over her by revealing ‘Actually I’m the one with the Dark Lord in his head, I was just manipulating the boy in a complicated plot, as is my style,’ she still might maintain some loyalty to Harry because manipulated or not, he still broke her out of Azkaban and performed all those impressive feats for her in the process. Especially the fact that he faced down the dementors without a patronus made her think he might actually be coming to care for her even when she thought her rescuer was the dark lord, knowing that it was actually the boy he looked like who did all that for her is likely to inspire some loyalty.
On the other hand, the dark ritual assisted brainwashing she went through was so thorough she was willing to Crucio herself, so the Dark lord might be willing to rely on that to prevent her from obeying Harry instead of stealing from her the memory of what she owes him.
Either way I imagine that the obliviation Harry saw was likely to be fake, after all he would probably want her report on the events that occurred while he was unconscious in case Harry left any details out in his summary.