The part in consecutive order with the 2nd being the third

After that, she woke up in a dark room with a gag around her face and her arms tied together. Alexa noticed someone across the room from her.
Oh joy, Sandra, she thought to herself. She sat there quietly and tried her hardest to squirm out of the knot that was entangling her wrists. The person who tied the knot didn’t do a very good job on it. The rope fell to the floor with a thud.
She wasn’t sure if Sandra was awake for lack of movement so she started working on the gag. She heard footsteps coming down the stairs. The footsteps stopped and the doorknob started jiggling. Much to Alexa’s surprise, a woman walked in.
The light switched on as the woman whispered “Hello?” Alexa slumped quickly back over the chair pretending to sleep. After no answer, she started to leave. Alexa started working on the gag again when the door flew open.
“AHA!” The apparent kidnapper cried. “I knew you weren’t still sleeping.”
Alexa was surprised at this younger woman’s down to earth attitude. Sandra started waking up, blinked a couple times, sat up and screamed. Alexa just rolled her eyes and quickly finished taking off the gag and threw it to the ground.
“Why’d you kidnap us?” Alexa inquired with a fury about her.
“That’s not important now—“
“Yes it is!” Alexa interrupted.
“No it’s not, I swear. I just need you to come upstairs. It’s dinnertime.”

Part 2 of my story

“How did you know I would be here?” Alexa asked, acting friendly.
“You sent me a note saying to meet you here.”
This drove her mad. Alexa didn’t send her a note. She knew exactly who did it, too. It was her old friend, Sylvia.
Sylvia and her used to hang out all the time in school and even after school. This was up until last year when Sylvia was reunited with some of her old friends that Alexa wasn’t fond of. Sylvia wanted to hang out with Alexa but Alexa didn’t want to hang out with her. Alexa secretly tried to hide this but she trusted too many people. One person told Sylvia and Alexa didn’t know who.
“Note?” Alexa asked trying to act bewildered.
“Yeah, this note”
The note said:

Hey Sandra,
It’s Alexa. I haven’t really gotten to
know you and I would really like to.
I usually go to the park at around one
in the afternoon. Would you meet me
there?
Alexa

The note proved it. She could recognized the printing from all the hate mail she got from Sylvia. Alexa was outraged. This didn’t even sound like her. Alexa hated meeting people. She hated people.
They heard rocks crunching beneath feet and turned around. No one was there.
“So do you want to come to my place for lunch?” Sandra asked.
Alexa was mad at Sandra. She knew Sandra saw the sandwich she was holding. Still, she pointed it out anyways and told her she had to leave. She was still making excuses to why she couldn’t come when they heard the footsteps again.
“Okay, Sylvia. Ha ha! Very funny. You can come out now,” Alexa sarcastically yelled.
Alexa turned around only to see her “friend” was gone.
“Oh, well. She must have gotten scared off,” Alexa said to herself.
Alexa was about to leave to go home but she tripped. That was the last thing she remembered.