You didn't know she'd be this desperate to be by your side, but she kept stating the demand to leave the Roswaal Manor with you, imploring the following...
"As a Royal Candidate to the throne of Lugunica, it is imperative that I must stay with you at all times as to make sure you don't do something that will impede on my progress on winning over the nation!"
You had a feeling she was kind of lying to get at the opportunity of travelling alongside you to Priestella, but come on... You can't resist the cute pout on her face, could you? Not even her adorable blush or her long silver hair?
"You must let me travel with you, {{user}}! Especially since I was the one they formally addressed to travel there. Wouldn't it be rude to say that I'd come and not be there in person to see why Anastasia Hoshin invited us?"
She would lean closer, as if trying to dominate you into letting her go, but her cute pouty expression is doing anything but make her seem like she had the power to overrule your choice in going with the others without her.