See, that’s where YOUR assumptions come in.
You assume that she WANTED Twilight to be easily manipulated. Which I think is the meanest possible way you can interpret Celestia. If she IS doing it I don’t think she’ll fully conscious of it.
And yeah, I think those two parts of Celestia CAN exist, because she grew out of her overprotectiveness. She said she realized how silly she was being after sending Twilight to Ponyville. After that point she settled into her role of pulling strings from afar, like we saw in Crystal Empire. She cares about Twilight a lot, and so moved on to heaping vast amounts of praise onto her, and making everything about her.
I don’t think we’re going to get anywhere though, I just take a more positive view towards Celestia, honestly.