Being a strong female character and being defined solely by their relationships with male characters is not mutually exclusive. Lyse is given an automatic boost to commander of the Resistance because of who her father was, even considering that she doesn't have that many great leadership qualities. I don't think Minfilia was a very well-written character, but I'll still say that she was a better leader than I expect Lyse will be.
Yes, I am seriously saying that there are women who chat at length about things that have nothing to do with romance. Here's a short summary of things I've talked about recently with one of my female friends:
- Wholemeal cinnamon rolls are a terrible lie.
- Never buy gluten-free cake, especially at $6 a slice.
- NieR: Automata sure looks awesome, but it sucks that we can't afford it at $100+ on Steam.
- Awful customers at our past/present jobs.
- University applications.
Note how none of that even remotely involved romantic prospects, because we couldn't care less about it if we were paid to do so. There are plenty of things they could've talked about, without defaulting to romance.