You don't really think that are her best feats do you? 😬
First of all, she was IIRC injured and exhausted for the Sith feat.
Secondly, besting Lah is far better, as she bested Lah as her legs pinioned - so massivly hindered.
We have to consider that Lah is above any other Vong (bar Shimrra) - so above Shedao Shai.
Shai himself is
1. Above Kyp Durron, who fodderized Vong
2. Equal to a injured Corran Horn, who is damn durable.
Corran lost slightly to Kam Soulsar, around a decade prior. Kam himself fodderized a Dark Side adept of Palpatine. IIRC, they were stated to be > average Dark Jedi -and as Vill Goir was a "mentor" of them, I suppose he's even higher than the average, but that doesn't matters-, but I don't find the quote.
So, basically, 28ABY Jaina is above Lah, by a considerable marigin, who is above Shai, who's close to NJO Corran, who -by all means- should be aboce Dark Side adept stomper DE Kam.
Add in that this feats are 16 years pre-prime, and sje has ****ing Skywalker potential, then yeah, it sh!ts on blitzing two Sith.
Then we have her being "the equal of anyone in the Order", and her being compared positiely to Luke.
The first quote basically says that she's above, or at least equal to, anyone in the order -bar Luke-. That means she is above Corran Horn (who himself should be below Saba), who was equal to/above Valin, someone who did a decent performance against Caedus, and hold off Ben and Vestara, who can fodderize Sith.
She is also above Kyle. Kyle bested the Seven Dark Jedi at the beginnning of his training -you should know that feat- and was seemingly at least equal to Gaalan, someone who can hold his own against Luke on Dathomir.
Then he's above the likes of Cilghal, someone who stomped a Jedi, that bested a Mandalorian Commands, which are specially trained to best Jedi.