I would point out a few things there:
1. Take a good hard look at some of those allegedly "conservative" groups that are rating these legislators. Any group that gave Justin Amash a 99% rating has an agenda that probably isn't going to win elections in the U.S. That dope voted to impeach President Trump in 2019, left the Republican Party, and refused to run for re-election in 2020 because he couldn't have won against a pile of dog crap. He's an open-borders globalist whose agenda is fine for these so-called "conservative" groups that do a great job of pissing a lot of American voters off.
2. When it comes to a sitting governor, I don't pay much attention to that person's prior track record as a legislator when considering him or her as a presidential candidate. One reason why House members and U.S. Senators tend to be awful political candidates is that the votes they cast when representing one district or state are often at odds with a position they would take on behalf of the nation as a whole.
3. Don't diminish Noem's COVID response, no matter how small her state may be. She stood head and shoulders even above other governors -- including Desantis -- who were far too quick to sacrifice freedom at the altar of some vague, undefined vision of "safety." If Desantis didn't have other great qualities as a candidate and wasn't much better than most of his peers in this regard, I'd consider his COVID response to be a total disqualifying characteristic for higher office.
Here's where she differed and agreed with that group (Club for Growth); none of her differings look conservative to me - and one might say the same of some of her agreements.
https://www.clubforgrowth.org/scorecards/legislator/N000184/Kristi-Noem/