Article continues below advertisementMeghan Markle's estrangement from her former best friend Jessica Mulroney is now as bitter as it is enduring, with sources telling OK! the stylist is "quaking in her boots" over the influence wielded by the duchess.The pair, who were once inseparable in Canada, are said to have drifted apart following a public controversy surrounding Mulroney in 2020, and insiders now say the fallout has left Mulroney cautious about speaking publicly about her former friend.