Shamiko is stronger than people think. Hell the Machikado event in Kirara recently proved that. If you just fuck with her mind a lot, and remove all the mental weakness, make her think she's a villainous demon lord, suddenly she can be pretty bullshit. She was even stronger than Momo.
-Perfect defense Kikiki Kanri clamshell form, nothing can break its defenses
-Perfect speed kikiki kanri mountain god form, allows her to run so fast that even she can't keep up with how fast she's running, too fast for the human eye
-Super loud telepathy can stun any opponent
-Anything rod which can become anything, literally, only held back by her own mental weakness, which in the most recent chapter she started to overcome. Once she reaches the true power of BELIEVE she'll be able to do anything
- Anything Rod can become literally anything that is a stick, even entirely make believe items such as "Instant I win button on a stick", if she went full retard
-Super Succubus lineage, can control dreams, rewrite peoples memories, she could even control the entire town in a single night if she felt like it.
-Demonic Charisma, Momo does confirm that Shamiko's power to use the power of those around her does count as one of her abilities, as a demonic mistress
-Various other demonic powers
It depends on how ready Shamiko is for her. Suika tries to use a fire attack, Shamiko hides away in her clamshell which even angel Zikeal couldn't break into, Ogura throws a knock out potion through the window. Suddenly Suika is knocked out for the rest of the day, Shamiko can infiltrate her dreams at her leisure, brainwash her however she wants. Its a strategy that worked against Momo, Mikan, Riko, and several other top tier characters all at the same time.