She indeed wanted MC to be a role model, or rather, to continue being a role model. IIRC, Raiuss initially wanted to beat Haruto so he trained. The more he trained the more that arrogance and such turned to respect. Also, his shit personality was party due to his mother too, she was trying to mold him into an easily influenced person so that when he gets to be king, she'll still be in control. Hell, in the webnovel at this point in the story she wanted him to invite Char on a outing so she gets killed.
However ever since his lost he and his mother have been estranged little by little. Especially after she got collared by Haruto.