Honestly the isekai elements are just a boat-anchor on this; most often when her "other world" experience comes in is when suspension of disbelief is stretched the most.
Well, I say it's a boat-anchor, but it's not really stopping this from charging ahead with aplomb.
This author actually has some talent for writing high-stakes court intrigue; this is basically a court thriller in the latter chapters and even if it's got some rough bits around the edges (see "isekai", supra), I definitely don't usually get so much screeching adrenaline from these sorts of soft-power lords-and-ladies exchanges.