With all my respect, you are confusing democracy with a republican politic system (locke chech and balances).
Here the point is that she won elections by 54% of the votes with about 36 points of difference with the second. It gives her ligitimity to her government.
It also gives some extra votes at Congress that alliw her to makes things happens as soon as she has her own quorum to open debates at Congress. This is how democracy works. People voted her project.
Sorry, but there are many things that works very bad in the US, corruption among others. I don't think that in a police state like the US become a real debate about corruption is possible. Lobby is legal there, in the rest of the world is considered corruption.