The issue now is whether or not she was able to fly out of the east coast to get there. Winter storm Nemo has dumped feet of snow on certain areas and thousands of flights have been cancelled. We'll have to see at tomorrow's show if she managed to make it.
I historically haven't really given much clout to BAFTA (British Academy of Film and Television Arts), but the more I think about it, it's a huge deal. Big stars show up for the ceremony and it's probably best to consider it one of the important predictors of Oscar results. They have some different rules regarding timelines, and I notice that they tend to favor British actors and films , but I wager it's still a big honor for recipients.
I was surprised that Meryl's win last year for The Iron Lady was only her second BAFTA award. The first was not even for Sophie's Choice, but for The French Lieutenant's Woman, where (surprise surprise) Meryl plays a Brit. I'll leave you with a clip of Meryl's acceptance speech (and shoe mishap) from last year's ceremony. Nerve-wracking being up for a British award for playing a former Prime Minister!