To me, it's more accurate to say Lindsay doesn't interact well with people, irrespective of age or gender. Though, I think this has more to do with the writers always trying to hammer home their characterization. Stella loves and is loved by kids, those scenes therefore cannot go to Lindsay, as there can only by one earth momma on the show. Danny's little heart bleeds for everyone, so he can love / be loved by all. It's Mac's job to be there for the younger ones, so Danny can't confide in Flack anymore and certainly cannot be there for Flack when needed. I know who the leads are, but they need to spread the storylines about, to make it more realistic. Characteristics can and do overlap in people living or working together and everyone develops and grows over time. Lindsay need a complete re-write, but could be developed properly if both the writers, producers and actress are willing to put in the effort.