I will certainly attend some of the live performances, because as I have said many times, overall (meaning skills, performance live, interesting compositions, and meaningful lyrics) Rush represents the finest music I've encountered. But without Neil Peart, my personal opinion is that this group should not be called Rush, and should be given another name. Peart was absolutely the driving force behind the group, meaning that literally and in a half dozen figurative ways as well.
The new drummer is a great choice, and I was aware of her work before, though among a number of up-and-coming drumming talents. If Alex and Geddy feel she is the right person then I am sure she is--to perform the songs, but quite obviously not as any sort of replacement for one of the genuine legends in music history.
She can play the songs. Here's a good example of her performing polyrhythms of the sort that only people like Neil Peart and Max Roach could do. This is a far higher level of drumming than mere speed.