Best friend trouble

Jenine

So my mom bought me a plan ticket last night to come see her and the rest of my family. My beat friend wanted to go with me so I told her last night to buy her ticket so she can come with and she says can your mom get for me and I’ll pay her back in a few months (ticket was only 200) I told her I didn’t want to ask my mom that. If she wanted to ask she has my moms phone number and to call her herself so we Argued about it and finally I gave in and I asked my mom and then my mom said no because Alley is not her daughter and she doesn’t feel that she should have to buy her a plane ticket and then I told Alley what happened and Alley got all mad at me and said that she feels like she can’t be trusted because no one will help her out to buy her a plane ticket so she doesn’t wanna go anymore and continued to tell me that she doesn’t feel trusted and she doesn’t feel like I’m her best friend anymore what should I do