Is it normal about this girl ?

I have a problem with this girl- Sara (not her real name). She's going to my school too. But I only knew her when she came working for my mom at her store as a part time job. My mom and Sara quickly became best friends.

I don't know what my mom told Sara about me but about a month ago, she started to think my mom wanted her to be my wife or something. She kept making me lunch and homemade snack and forced me to eat in school. I didn't want my friends to see that so I tried to reject but it didn't work.

I asked my mom if she had said things that could have made Sara mistaken. She said she sometimes told Sara about me when I was little, nothing more. The food supplying kept going on so I decided to talk to Sara face to face and asked her if she had feeling for me. But she denied it. She said that she made lunch and snack for her friends too. so I guessed I was the one who overthought.

Two days ago, I was sleeping after a very long exhausting day, it was 10:00pm, she called me and said that she was at the door, asking me to come down because she had a gift for me. I was too tired to move out of my bed so I told her just ring the door bell so my mom could let her in. She refused and asked me to come down myself. I got mad and told her that I'm not her servant and I didn't like the way she forced me to do as she pleased.

The next morning, my mom was super upset with me because her best friend Sara wanted to quit the job at the store and she seemed to be very hurt by what I said. My mom commanded me to go to Sara's house and find a way to apologise or she would never talk to me again.

so I went to Sara's and apologised also asked her to hang out to make up for the previous night (I'm skipping the whole part of crying and drama tears which was so annoying) . I didn't want to talk to her much so I decided to take her to a movie. But I was so wrong, the whole time we were in the theater was torturing. Sara didn't pay attention to the movie, she kept turning aside and looking at my face. I tried not to get my eyes off the screen but it was super uncomfortable. Sometimes I had to remind her that she was not watching the movie and gave her the most painful smile.

What am I supposed to do ? I want to tell her that she needs to stop it but She keeps saying that she's not into me. Can you guys give me some ideas how to solve this ?