I Can't Handle Pressure

I feel like I'm pressured but zi shouldn't. My friend is trying so hard to find me a ride because her mom doesn't want her to hang by herself and my dad doesn't want me talking the bus at 8pm so no ride, no go. I told her I would have to go another time because nobody will be there to pick me up be side they will be at my cousins party at 2pm my friends event at 5pm and ends at 9pm. It's downtown. My friend said maybe her friend can take me home and she'll ask him. I appriciate what she is doing but if I can't go I can't GO. She is trying so hard to get me a ride to go home. She REALLY REALLY wants me there. She said, "I'm going to get you a ride. My mom needs you so I won't be alone." Her classmates will be there. My other friends invited me to to shopping the next. I may not be able to go the next say because my other friend wont be able to pick me up Saturday because she has to work so she is hoping someone can drop me off at her house after my friends event. So much pressure. Being needed too much is way too much for me. I felt like crying. My friend said, "I hope that's okay with you." Im sorry. I hope were still friends." Of course we are and it isn't her fault. She said, "Are you sure? If you're upset at me, JUST TELL ME. Don't sugarcoat your feelings to protect my feelings." Has this happened to you?
Not to be rude but her classmates will be there so why does her mom need me?