Is it normal my sister wants to stay with me?

When she found out I'm going to move out, she kind of panicked. She asked me not to go and when I told her this was the next step in my life, she asked me to take her. I figured she would get over it in a few days but she just got more desperate in trying to convince me to not leave her behind. I tried telling her that it wouldn't be easy and I wouldn't have much money to spend and we'd have to share a bedroom and so on, but she just agreed to everything and said she'd get a job to help and would do whatever else it takes to convince me to let her come along. I finally realized there was nothing I could do to change her mind. I asked my mom and she supports whatever makes us happy. Although I'm guessing her actual reason is more two birds with one stone, no more pesky children! But anyway I'm at an impasse. I love my sister and don't want to break her heart like that and besides I won't be lonely if she comes and she can help with chores. But I hope she can live on her own eventually because don't think I want to spend the rest of my life with her and it could be awkward having two people in a fairly small space. For instance if I'm going to come home with a partner she needs to disappear until I call her to come back but I think I can avoid that. So I'm not sure what I should do, I want to take her but there could be problems. And I swear it really seems like the price of bunk beds has gone up.