I see why you think that, but there are also a few points that speak against it, first of all Elaine told us that MCs father hated it when his women show skin, can you imagine how much skin a young(er) Angel, who wants to be a model is showing?
But the mature point would be that Angel says that he left her, she was depri before she decided to start working with that agency where by now she already worked for a while. Of course, all that could have happened in a week before MCs father died, but to me it sounds like something that takes place over a few months probably even longer. So why after a year (random date) would MCs father still put her in his will?
So maybe she was dating MCs dad at some point, but she's probably not the gold digger, but only cheeky knows for sure.