On regaining her memories, we as the audience knows what's up, but we still don't understand how it's completely affected her. She acts like an idiot, but has shown a mature, serious side that is willing to be the queen she was meant to be. She's still hasn't really opened up to her parents, and she is viewed to be inferior by the ministry of magic. She has enemies within herself and from those around her as modern views make her seem like a heretic to the public eye.

She still can't use magic (it's the spirit system guys), and still lacks in being able to create what she wants. Having to even use magic stones (from monsters), to create permanent tattoos just to be able their abilities

The politics stuff just shouldn't have been a thing honestly. Strong point of this series was the magical stuff which gets shoved in the backseat to make way for a bunch of repetitive conversations.
It's also at this point where the quirky genius MC turns into dumbest character in the room in every situation. 50% of her dialogue turns into really dumb questions she already knows the answer to, the other 40% is some derivation of "eh?! EH?!" and the remaining 10% is generic japanese tropey hopes and dreams and making everybody smile stuff.

Main character wants to work on magic and doesn't want to be king, but will do it anyway because it's a responsibility she has to carry, love interest wants MC to be free and doesn't want her to be king.

This issue is resolved by the girlfriend kicking mc's ass, becoming a greater spirit in the process, and adopted by the royal family to become king instead. Instead of being granted freedom MC gets commandeered by her girlfriends ex-dad to mass produce weapons for the military.

There is apparently 0 problems with any of this.

She isn't even mildly upset that everything she worked for was crushed by her Mary Sue girlfriend because she suddenly gets god-spirit powers mid-fight. Additionally these powers come at the cost of her girlfriend literally getting her soul replaced by spirits. That's some ship of Theseus horror stuff right there, and apparently nobody takes issue with the fact that she basically killed herself and got replaced by a spirit wearing her skin.

She's (kind of understandably I guess) not upset when that girlfriend takes her position in the royal family.

She's not even upset when her girlfriends dad, who also targeted MC in the past because he was worried about MC leaving and spreading her inventions elsewhere, takes away her freedom to get her to make more weapons. She now spends most of her time doing paperwork and managing mass production of magic tools rather than doing the research she wants to do. Not even the girlfriend is upset by this when she literally did all this sh*t so MC could be free.

She's not even mildly upset when her girlfriend humiliates her at the Ministry when she tells off someone who's been blatantly hostile to her, and tells her to go home like a child. Their relationship isn't strained at all by literally any of this.
It's just me but I really hate the trend of mc's being inhumanly s*upid because apparently that's comedy. It gets tiring reading the MC be a slackjawed-drooling-doormat for the nth time.

I think the idea was to show that through hardwork the common man could match someone talented, but the girlfriend just kinda ends up being superior to MC in every fashion despite that and ends up being a kinda depressing comparison point. Girlfriend is a magical Mary Sue and can basically instantly do anything MC takes time to develop. She can also handle being the queen and doing magical research while running the Ministry while the MC apparently cannot. MC has spent time training/adventuring yet gets crushed in a fight by girlfriend who hasn't. Even worse she loses to a random guard side character she used to be able to beat. So if you want power progression you're going to be kinda disappointed here. Girlfriend is now an all powerful immortal great spirit and MCs just gonna get old and die. It just seems weird that no matter what she does she'll never actually succeed, and yet it's framed as if her dream all along was to become an arms dealer and bring self-heated teapots to the average commoner instead of her dream being to do magic herself.

There are some significant differences from the manga so far, and probably the ln too, but I would recommend reading those versions instead if you can. The manga's 20 chapters atm only reach to like chapter 10 or so of the webnovel but I think it's done better. In the manga version the dragon plotpoint has a lot more emphasis, and MC seems more focused on gaining magic for herself.