Stealing luxury goods to tempt an old man's avarice in order to learn medicine—hopefully fast enough, maybe fantasy medicine isn't a highly skilled trade?—to outmanoeuvre your mother's would-be killers, hoping that indeed the methods they try can be countered with medicine, though you happen to already know the serving maid can easily overpower someone and murder them with a mere scrap of cloth...
This seems like a great plan, nothing could go wrong.