i dont think she can as he is the emperor tho koharu
She called him father back then and even told him she's going to kidnapped him so he can't meet Soleia. Calling his name doesn't seem that bad lol. Plus they're both alone there so I'm sure it's fine
Yerenica why don't you try calling his name first, keep calling him again and again until you break his walls down (▰˘◡˘▰).