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help, quests]
Angel will visit the Library at school once you're intelligent enough. (RNG) k int 100, checked all periods i guess, no luck in catching her. dont even remember who is that, maybe i completed that and she moved away like some npcs do.
-- If it says this in the notes, she should pop up in the library, no matter what day or time(as long as school is open). Try it a lot of times to try and trigger the event.
how to invite
Whitney to BDSM house ? had 3 visits with last scenes sequence repeats. no option to invite. do i need more visits?
You need to have the BDSM house completed and be at the BDSM house on friday morning to invite her there!
Calibri
i probably finished some interaction. tweaked relationships back to 0, spotted her in teachers room as usual, discovered psych her option (i guess i did that before.) -> her house gangbang sex scene opened. second time i met her - same repeatable scenes. nothing new in tips (blank), no changes.
* though if i tweak her relationship to 100 i get '
But you've blatantly lied to her with her trust-issues ' and i cannot pscyh or interact in any way . so i assume that some interactions would have led to that but no tips on how to have such interactions in the first place ...or to restore it (if i messed something first time i played) ...
-- Tweaking those kind of stats will mess up the game mechanics because some variables are related to each other and should change simultaneously when you've legit progressed through the storyline of characters. I suggest you to not mess with relationship variables of characters because it sometimes causes these issues. (setting it to 100 is a coincidence that you get that response.) What probably happened here is that you've made a wrong decision and have to live with the consequences

jokes aside, put the relCalibri variable on 1 and try again. Next patch the tooltip is updated, along with a button to retry with her if failed.