Sister is Overstepping Creative Control?
Hi all, so I am new to playing D&D and have been invited to a campaign of a bunch of other new players. Our Dungeon Master is very experienced (so he says) and has agreed to teach us all how to play. I am a Ravenclaw at heart so I obviously read the entire handbook before even creating a character. I also have been listening to the Critical Role podcasts for over a year. I feel like I understand the game fairly well, unlike my sister, who is also in the campaign.
Before we started, our DM asked us what we wanted our character's reasons to be at this cave of goblins. From what I understand this isn't normal, but maybe it's the way he wants to play. Well my sister, who plays a half-elf rogue, said her character got word on some treasure inside and decided to investigate.
So we all go in, spells firing and clear out the first part of the cave. Well anyone who has played before knows, it doesn't end here. The DM has more for us to explore, so we find a tunnel in a dark corner across a pond. My sister's character announces that we should all go in with her to help her find a magical ring that she was hired to find and would split a 650 gold coin reward. My character needs money so sure. We ended shortly after for time reasons, but the following morning we were texting about it and I mentioned how that was really cool that she organized this with our DM before hand. Turns out she didn't, she had just made up the ring, the gold reward and the job on the spot.
The DM didn't say anything to her, and I am still new to playing so I would like to inquire as to if I should mention this or not. Thanks for any and all help!
P.S. Her character also pickpocketed mine and asked what she had to roll in order to suceed before rolling, and then rolled higher then needed. We are on Discord call and each have our own dice roller so there is no way to tell if anyone is lying. She had consistently perfect rolls the whole game and kept "offering" to screenshot her dice role to prove she wasn't lying even though no one had accused her.