No, she was trying to gaslight Wanda into accepting death basically.
Like, they clearly showed that Agatha kills people by taking their power.
Otherwise, if she truly didn't want to kill her mother, she could have taken the power without killing her.
And you're accepting Agatha's decision that Wanda is a threat, but you deny the coven saying Agatha was a threat. The coven who was following the same book as Agatha?
So it's either both are wrong, or both are right.
Either way, Agatha would be in the wrong for doing the same thing her coven did, she'd be hypocritical.
And again, you can clearly tell from Agatha's words that she knew fully well the magic she was diving into was forbidden, and yet she did it anyway.
She lusts for power, and it's obvious.