[DAI Spoilers] About Varric and Bianca

I really, really love Varric, and I'd like to bring him out more often with me. But the problem really is Bianca. Varric always ends up being near useless as the rest of the party levels up, because I can't make Bianca powerful enough to match the enemies. Any tips how I should update the crossbow?

Speaking of Bianca, what do you think of the woman-Bianca, and her relationship with Varric? I personally think that she's someone Varric should move on from. She just doesn't seem to genuinely care about my favourite dwarf, and at least in Inquisition she comes out a very unpleasant character in general.