I got in a fight with my friend :( can you help?

[LOL]

We're best friends and literally known each other since we were born! We got into a fight today and I think she took it as a big fight. What happened was our friends were planning to go to the movies this Saturday and have been planning it since the beginning of last week and I was asking her if could go today and she said, "idk". And I asked her, what do you mean you don't know? She said it was because she was broke. Then I told her just ask to borrow some money from her parents, the ticket only cost six dollars (I think). She said she would feel bad for taking her parents money. I found that a complete lie because she always asks for stuff from her parents. I told her that she always uses her parents money though and she told me that she still feels bad though. Then of course knowing that she was making up an excuse for not going I started to question her. I asked why out of all times now stop asking? And I said borrow not take if that was actually the case. Then she finally said, "I WENT OUT LAST SATURDAY SO ITS A NO." Earlier I asked her if she asked her parents yet and she said she didn't yet which made me a little frustrated that she's not asking her parents yet when we all planned this a week ago. I don't mind her asking her parents at the last minute. But that's not why I'm frustrated with her. I got frustrated because she knew she couldn't come since last week and every time I asked if she could go she kept saying, "idk". Or make up an excuse. After she said that she went out last Saturday and she can't come. I told her that she could have told me she couldn't come way earlier since she knew she couldn't come the moment we planned the group outing. Then she said, "Well geez. I'm sorry". Then I told her that she didn't need to say sorry then she swore and said,"Well what the fuck am I suppose to say then?" I then asked her if she was mad at me and she said no. Of course since knowing her for so long I know when she lies. I can tell if shes lying just by her typing. I apologized to her because I felt bad, I didn't mean to come off as pushy or intimidating. She didn't say anything or say that it was okay. She then started posting statuses on facebook like," We didn't stop being friends, we just stopped seeing each other as friends." That made me feel horrible. I don't know how to make this better! She's acting all happy now but I know she's not, I know she's still mad at me.