Carrying weight and being strong, or having the will to fight against someone, is two different things. You can bench 400 pounds, but if you're light hearted, it won't matter.
Bell splits the loot 50/50, just as any other cliche show, because he's a character who, for lack of a better term, believes in equality. Sure we show the first bad guy taking all of the loot, leaving her with nothing, but thats just character to character. I don't think she really expected that much out of Bell, but when she did get 50% of it, was a bit confused as to why, since she knows shes pretty useless.
Also, the last few minutes weren't interpreted the same way as me it seems. To me, it seemed like her wanting to say Goodbye, was a result of no longer putting up with her familias shit. Sure she has that debt to repay for something, but I don't think she would up and leave Bell for being too nice. If it was being careful to not get close, I'm guessing we'll see the, "No Lili-sama! You misunderstood me! I wan't to protect you!" *Blushing loli* Aye!
Her dagger isn't that good compared to Bells, since Bells scales with him as he gets stronger.
Hestia is my waifu, fuck off faggots.