Dr. Rosenberg is a special case. I can guarantee you that she has no ill intentions for the family. She is extremely curious about the relationships the MC has to his family members. She might even have something of a background regarding this as well, something she of course would never admit in a therapy session. But maybe during a private meeting? Who knows. All I can say is, she doesn't mean any harm for anyone. But you also don't lose much if you decide to not go her route, except the probabilty to bang her so hard so she stops putting the glasses on and off her face.
Like Thorin said, Lena is a special case. Don't forget that you have been in a relationship with her for more than 18 years, so things can't progress "slowly" anymore. If you don't want to go for her thats fine though, she will make some remarks during certain talks though and you will hurt her.