who is right?

[Bmil]

ok, so, me and my sis were playing very hard VR temple, to get to the seabed to try and get the agito 1991, in room 2, i killed a grass assassin and then my sister looted it, then a couple rooms later, i killed a dimian or la dimian and it dropped a double saber, she said it was hers because she called first special weapon sword, we usually play i get first special weapon, she gets second, but she diecided to be well, a female dog, and complained that i took it, even though she took my grinder, now she is trying to give me the grinder in exchange for the double saber, and i am sayin no, so she called my mom, and complained, my mom told us to get off of PSO, my sisters arguement is this "you're stronger, u can get one another time, u have a better chance of getting one" who should get the saber? me for finding it, or my sister, for "calling it"