I don't know if it's just mood swings or what...

So, my friend and I had been in a fight for a while now (let's call her Lily). So a few days ago, I called Lily because the fight we were having was practically over, our issues had been resolved. But Lily sounded very mad and acted like she wanted nothing to do with me. Our overall conversation probably only lasted one or two minutes. So the next day, I expected her to still be very mad at me, but she called me and acted like nothing had ever happened! I should also mention that we were on a three-way with one of my best friends (let's call her Amy). Of course I was grateful, but about 30 minutes into the conversation, Lily started acting pretty weird. I was telling her about the songs I liked and didn't and usually songs I did liked she didn't and vise versa. But that's not the weird part.

Then she started trying to tell me what to like and what not to. I thought she must be joking, because the way she was trying to control me sounded just plain ridiculous. So I told her calmly that there was no way I was going to change my opinion of music to match hers. Then she got really pushy and started telling me to just shut up and listen, and that Amy had a bodyguard that would hurt me if I tried to hurt her. I thought this must be some part of some big joke, because she sounded just plain stupid. Then, I said goodbye and hung up, because I had to leave anyways.

But today she called again. I expected her to try to control me again, but she just told me about this cool site she found. She was really nice during that call and didn't say one weird thing. Our conversation didn't last very long, though, because she had to leave once she told me about the web site. I should probably say that Amy was three-waying with us during that call.

Now I know it's not Amy behind all this, because I've known her a lot longer than I've known Lily, and she's way too nice to do something like that. But Amy is a huge follower, and will back up Lily in pretty much everything she says. Now keep in mind that I'm not very confident, and I'm more of a follower than a leader, and Lily is defiantly a leader-type person.

So, is it normal for a friend to have such drastic mood swings?