Yes, it's intentional. Unlike Erica, where she will be more willing to do sexual things with you when relationship points are higher, for Angelica it is other way around. The story will slowly unfold why... during pool scenario with Erica there are already some hints.
When you are strict and dominant she is more attracted to you even if you parent her harshly, if you are trying to be nice, she considers it as weakness and she's trying to use you. All around she's is not supposed to be sweat character, but rather spoiled brat without father figure so far... that's why her name - Angelica - "being like an angel" - oxymoron.
I get some complaints from people who want to treat her well and want love/romantic route with her without being used as sugar daddy and without being too harsh on her. Both routes will eventually have possibility to go for more romantic settings. However only strict daddy route will save her from doing Lewd stuff on internet for a living. Also on strict daddy route most of harsh admonishings are avoidable (e.g. dildo embarassment happens only if you did something naughty before - i.e. spying on her)
