we have the same pacing issue, which really makes me wonder about acceleration ever being a workable solution. It's good to hear it might just be a spurt. I also have wondered if it's just been going so fast while we catch up to where she really is.
To give you and idea of the pacing we've been going at, we've gone through Singapore math Kindergarten, 1AB and 2AB using only the textbook exercises, not the workbook. And that's taken about six months. We've only slowed down when there have been concepts she didn't already understand, like we had a month or two where she needed to really work on place value, then long division is holding us up right now (need more multiplication facts), telling time was a non-starter until this week, and she's having to concentrate to get multiple digit multiplication.