Junior SPs you can't add a combination to the solo triples anyways, so missing your planned combo is a huge point loss even though it's just 1 mistake. Polina is consistent, her score in the SP at GPF was so low because she had to do a 3lo (not one of her best jumps) and she missed her lutz combo. In her senior SP she does a 3f instead of 3lo, and 3f is a better jump for her so should she miss the lutz she's more likely to be able to add a combo to the 3f (plus in seniors she'll actually be allowed to do this). Usually Polina has clean FS programs with very high content, recently, the biggest mistakes she makes in the FS is like 1 fall, which isn't a huge deal as she attempts 7 triples (repeating 3lz and 3f) and 2 2a, which hardly anyone else in the US does. When she does the SP with 3f, she's usually clean too, with a possible < on the 3t which again, isn't hugely costly. IMO, she's more consistent than most of the other US ladies. I can only think of 2 skaters comparable in their consistency and those are Ashley and Sam. Maybe Christina last season was comparable, but this season that hasn't been the case.
Polina's FS at the JGPF was flawless, but she was a bit underscored in PCS because she skated so early. Still, she finished 2nd overall in the FS. You can add 3+ points to the 113.50 points for the extra choreographic step sequence.