Quite a lot to work with.
(Doing this such that Plagueis doesn't lash out at her intolerably might be difficult... But Palpatine is starting to think her bigger concern is keeping Plagueis from learning about this woman.)
She has tasks to do, still, as Plagueis's errand girl - and the slave has her own jobs - but they can weave in enough instability, subtle, that not too long after Palpatine leaves, the entire thing should come crashing down.
And... It's increasingly obvious the slave is drawing on the light side. Palpatine has inherited much of Plagueis's scorn, of course - she has no patience for the Jedi's self-made chains - but, well. She can recognize a useful tool when she sees one, and while the woman is terrible at hiding herself - she actually shines in the Force, as ridiculous as it feels the first time her attempts to hide slip and Palpatine glimpses it -
Palpatine has always struggled with foresight. The future that unveils itself before her is murky and often more metaphorical than literal. Twisting, open to interpretation, and Palpatine puts more stock in it than Plagueis (who utterly scorns the idea of predicting rather than seizing the future), but... It's never been useful to her.
Until now.
The woman's only hindrance has been her difficulty hiding herself - a clear picture slowly reveals itself to Palpatine through her, one Palpatine is certain the woman sees even better - a million tiny levers, details no one else perceives, the future emerging clearly from this moment, flickers and glimpses of farther flung consequences, and Palpatine can simply ask what if and get most of an answer -
The woman struggles to take Palpatine into account in her visions, apparently, which is gratifying to hear. It complicates things, but all the woman's short term predictions are more or less accurate when Palpatine isn't screwing with them - and Palpatine will be here a while.
She learns to hide the woman, first, to disguise the echoes of her actions, to redirect attention, to let her walk where she may... It grates when the woman's visions adjust to her presence, but...