Flamestrike
Legend
What makes the most 'in game' sense is she took a few more levels of Jedi (which dont have any real RP requirements and dont require you to be a member of the Jedi tradition).She would have to take force adept levels. Level 12-14 seems viable no lower than 10th level 15 probably not.
Looking at melee duelist that also makes sense, scout or soldier levels maybe or perhaps force adept/disciple.
That buys her a couple of extra feats and helps her out with her pretty feat intensive fighting method (force training and dual weapon fighting feat tree eats up some serious feats, plus she wants weapon finesse - and is canonically statted to have it as well).
She needs 3 Force talents to get into Force Adept so that's a tough one. We've seen her Block, Deflect and Redirect shot so we know she has those three (and that takes her to 5th level).
We know she gets herself a Guardian Spirit (Moiri - that Bird thing) between TCW and Rebels. Luckily there is a Guardian Spirit Talent tree so she can easily take 1 talent from there, and the Gauge Force Potential talent and Visions Talents from the Sense talent tree (which she used on Grogu) and qualify for Force Adept.
That takes her to Jedi 11 with 6 talents (3 Jedi and 3 Force talents), and 5 bonus feats from those Jedi levels (9 feats in total).
Those feats are (Jedi starting feats) plus Weapon Finesse, Dual Weapon 1-3, Force Training x 3, Acrobatic strike and Rapid Assault from the Web enhancement (letting her move and full attack with a Standard action for a FP).
From there she needs at least 2 Levels in Force Adept which she now qualifies for (to pick up a force technique) and she can move onto Force Disciple if she wants, which is likely where we find her in 9ABY.