It wasn't just hinted it... her entire original storyline was based around the 1960s concept that she was his daughter and she was caught between following what her father wants her to do and following what she believes is best for her.
Then came the retcons including it being explained that wasn't really it was a robot.
Basically, that left Lorna with no underlying basis for thinking about who she is as a character or person other then her relationship with Havok and her powers. And, yes I liked as well in the 1990s the scenes where she questions why she is a super hero, if she is just half a couple with Havok, what is the status of their relationship, etc.?
But, currently the same oppruntiy exists for Lorna of questioning her place and introspecting and I have been a critic that she hasn't done enough of it at least since 2005, but that is a separate issue from her relationship with Magneto, Pietro, etc. Some of her best issues of all time were her dealing with physically and emotionally the fallout from the destruction of Genosha and the death of her father. They were good enough to end up being animated in the recent animated series WATXM.
But your point that we aren't allowed into Lorna's head the way we should of late to see how she views herself and the world I believe is quite apt.
I very much like her relationship to Magneto and Quicksilver, as well as Luna and Crystal. The only part of her family that she has yet to develop much of a relationship is with Wanda, but I see a lot of potential there as well.
Its given her a placement without totally defining her in the way some believe it does. She is on All New X-Factor right now with her half-brother Quicksilver and while their relationship somewhat defines their interaction, it more helps influence it.