It's true it's not her best step sequence. This one from last weekend was better for sure(it also is in the category it was choreo'd for so the ending works with the music far better:
From 2:18 or so.
But, there's something I have to say about the step sequence itself. It's very ambitious and not exactly cautious at all. It also is more difficult than necessary for lvl 4 steps. I assume you're mostly talking about the middle section of the StSq being slow so what we need to keep in mind is this:
The first combo's pretty standard, but the second combo's a left forward outside counter into left backwards outside counter(into loop).
So, the forward outside counter, we'll think about how often we see it... Almost all counters by the top four Russian ladies are backwards. I looked at Kamila. In the FS she did a forward inside counter, rest backwards. I looked at Kostornaya's SP and FS StSqs from last Euros, she did all her counters backwards from what I could see. Shcherbakova did a forward inside counter in her SP, rest backwards. Trusova in her FS did a forward inside counter, rest backwards.
So, none of Trusova, Shcherbakova, Kostornaya, Valieva did a single forward outside counter in any of their step sequences. Keep in mind that with Krivonosova it's the first step of a mandatory combo where clean execution is a requirement for lvl 4 step sequence. And keep in mind that Krivonosova isn't going to get reputation levels like these established skaters. As I was going through everyone's step sequences looking for forward outside counters I couldn't help but notice how sloppy some of them were, got to question some level 4s on those.
Then here's the second point I'd make - the two choctaws you'll find in just about every lvl 4 step sequence. In the SP linked in this video, that's at around 2:50-2:53 where she does rocker -> counter -> counter into... what I could call left inside crossed open choctaw into leg switch into left outside closed choctaw(into mohawk). Although I'm not an expert on naming choctaws. But in any case, if you once again were to go through step sequences, you wouldn't see a sequence like that. Actually, I think the only one doing the inside crossed open mohawk is Kostornaya, who also uses it as a jump entry with counter. Usually, there might be a single choctaw, or the Rhumba sequence of two choctaws.
So keep in mind, for a 10-year-old this is a pretty ambitious step sequence and not exactly conservative, as there also are way more counters than necessary for level 4.
edit2: I had a bit of a mistake there, 3 rockers and 8 counter turns in the step sequence actually.
But anyway, pay attention to the forward outside counter and how she has to do it, the sort of balancing it requires and think of why none of these top skaters perform even a single one in any of their step sequences. (2:35 - 2:37 in the SP video on this post)

As much as I appreciate Krivonosova, I'm still gonna root for Kostyleva in Novice Nats. I'm expecting great redemption performance from her there.

I should have been more clear in my post.