Sister inlaw thinks she better than me. Read till end

So my family decided to take a vacation this year. We got 1 hotel room with 2 queen beds it was my parents, my brother and his wife, my sister, me and my daughter well my parents took one bed and without even asking my sister inlaw claimed the other.... my sister my daughter and my self were sleeping on air mattress on floor. At the end of the trip my mom said let do this again next year so i said fine but, me, my sister anf my daughter get bed next time. My sister inlaw replied with next year im going to have a kid and we will not be sleeping on the floor!!!! You bet your ass i asked why me and my child can sleep on the floor but her and her non existing child cant.... what a bitch.