Ok, I did some lab testing and it only adds to all her other good points. Ecstafrenzy bowzon has a great time in Labs too. Wyrmshoot lacks damage with less mob density but tantrum/phalanx combo works really well. Tantrum kills all melee, and phalanx is guerilla type, working from behind the walls. In tiers 1-10 ama is literally immortal, has burst damage and that with no respec needed.
Red tiers require a dedicated setup, maxed fire ele/spellbind instead of bow skills (barrage, wyrm, most trinity). Since it would be best to get 200-300 bow + Tantrum (don't have it myself still though, feels great as it is) so maybe Magical craft will synergize greatly.
She clears tier 13 and should go even further. Some bosses on 13 already require effort dmg wise but overall it is fine.
Main problem would be not dying at the enter and t11 is actually harder than 12-13 in that. Killing bosses in t11 is easier though as phalanx works better in the open. Also when you're face to face to them they won't bug and cast invisible spells. Anomaly especially likes doing that with flamestrike, just a oneshot out of nowhere.
Rifting with this build is crazy adrenaline gameplay, maybe not the best labber but still very effective. Im also not sure which merc to change into, still sending my abjurer to death lol