This will probably sound really mean but I think Grace is both too dumb and too arrogant to make the connection.
She wants to believe she can manifest everything she desires because it makes her feel special; superior in a spiritual sense. I think her own self-worth is very much related to her feeling more enlightened than others now, which is actually really sad because so much of that enlightenment is based on bullshit. She swapped chasing thinness and money for chasing being some kind of guru.
She’s also not much of a deep thinker (despite her spiritual crap tricking herself into thinking she is). Grace seems to contradict herself a lot and potentially parrots things she reads elsewhere, hence me reckoning that she just hasn’t thought deeply about how her beliefs and actions in various areas of her life connect.
I mean, she’s yet to realise that a lot of spiritual and “earth mama” beliefs do not sit well alongside her being an influencer and therefore a figurehead of capitalism, and she also doesn’t seem to have realised that much of what she preaches is only accessible to her because of her (moderate) success as an influencer.