You shouldn't need any significant IND to properly dispel her; you just have to use the right kind of dispel. AKA, if she has magic reflect up, you have to use a PHYSICAL dispel (Sweeping on Satori, or Reisen), and for physical reflect you need any of the normal dispels.
I never ever had an issue with ANY dispel move not landing the Dispel quick effect on any enemy ever, and haven't seen anyone have this issue either; I've watched several people fight Hina onstream, onvideo, and done it myself.
Marisa also goes through Magic Reflection along with Reimu, and she's not hard to inflict status effects on if you have good IND, so you can debuff stack (You can also do this to make her deal no damage except via Pain Bond) and have Reisen do insane damage with her special slayer if you like.
She regens in dark land (but isn't weak to light). In order to activate the final phase, she needs 10000 hp, so you need to disable the regen with light land or a Poison status. You'll need a nuke that goes through reflection, and preferably deals 10k+ damage (Little Legion makes that not a requirement, though), but Reimu should do that perfectly fine with Fantasy Heaven or Hell and sufficient buffing.
Reimu and Sanae can also both cure the Curse status. Also, you could equip a empty star curse resist item on an attacker slower then Hina.
Pain Bond hurts, but only hits one person. Easy to fix the death via Sanae or commander Mokou. If the fight lasts anywhere long enough to where running out of bombs is even worth worrying about, something is seriously wrong.
aside from that: yeah, beat the terminator. it was a long fight even though I used mokou and youmu with enthunder, massive ATK buff etc. 210000 is too much for the poor me :<
It has really high Pdef. It's better to use magic. Patch's elec field is also super helpful because it greatly increases elec damage, as well as her being able to get elec land maxed in just a few turns with her normal spells. (Satori's Mad Thunder is hands down best attack on this boss with almost 30k damage every turn. Yuugi with the following strat or Nitori with her ostracon gun for huge tsukumogami slayer might be nice too)
Also, the mech dragon can be super murdered by Yuugi with the Oni's Metal Rod item from stage 22 and an Enwater/Weapon Bless buff. Like, it's easy to get her to hit 99999 with KOi3S+Youmu's commander 3bomb in that situation (And Storm on Mt.Ooe would still be pretty great if you don't have that) (This strat might work nice on the Terminator, didn't try it yet)