My flatmate (f25) has no sense of boundaries

My flatmate f25 is a very sweet and caring girl. But she has no sense of boundaries. After a long day all i want is to have dinner and watch movie alone peacefully in my room but she's always hanging out there. I have tried to be polite but she just doesn't get the hint. Things don't end there. Its annoying that when i am not home she keeps on taking my laptop to watch something. I have tried to keep it in the cupboard, take it with me but even if I am sleeping she sneaks in and take it from my room. She wants to do everything i do, watch the same shows, eat the same take outs. She is a very lovely and caring girl but i just want same space from her. Do you guys think i am overreacting?

Update: So I first changed the password to my laptop but as soon as she noticed she called me and asked me for the password but I hung up the call saying I gotta go ttyl. I thought she would take the hint but as soon as I reached home she asked me for the password again and again so I typed it in myself hiding it from her and said I need to use my Laptop to watch something while having dinner. She suggested for me to come to her room as she is already watching a show on hotstar. I was so pissed and finally confronted her but she said its just a laptop and I am overreacting. Later that night she ordered me ice cream as a way of apologising par pura mujhe guilt trip krdiya saying I thought we were friends😞