The truth was that everyone in the Royal Vampire Clan saw Ina as a stupid brute who only cared about her strength and improvement.
They all took her as a crazy young vampire woman that could be easily dealt with. It was also due to this that she didn't have much of a support in the Royal Court.
Since she had never expressed any wish of getting the Throne, the Nobles of the Royal Court had completely discarded her.
The only reason why none of them had moved against her until now was due to her Second Brother who had a following and a shot for the Throne.
But now with him gone, there was no one that was able to protect her, and what was more important her strength was nowhere close to theirs.
No matter how much of a genius she was, she still had to keep getting stronger for a few more centuries before she was able to reach their level.