Me and my friends were in a group together for a project. We had no transport to get to friend A's house, so we made arrangements for friend B to send us.

Everything was planned and set, so the day before the event, I asked friend B what time we should go over to her place so that she can send us. She said we had to leave at about 2 pm, so I asked if 1 was fine, and she did a vague gesture of agreement.

Feeling unsure, I asked her again, and this time she just shrugged and kept saying "I don't know, I don't know." I wasn't frustrated, but I was anxious to know what time we should go, so I asked her to please decide on a time. I did it nicely of course.

And suddenly she was like "Why do you guys keep asking? We might not even go." Obviously I asked "Why?" I mean, we did plan to go already, we even made confirmations that she would be the one sending us, we just didn't confirm the time yet! She gave excuses like "I'm tired," and refused to answer any other questions.

Next thing I know, she was giving us the silent treatment and any questions we tried to ask were responded with "Please stop asking questions." in a mildly annoyed tone.

I don't want to upset her, but I really, really don't understand what is going on. Obviously I feel quite annoyed myself at this point, but for the sake of our friendship I'm trying hard not to get mad.

Two questions: What should I do? Any opinions on why she suddenly got mad?

I don't think it's because she was in a bad mood that day or anything because she was happy and all till that question came up.

Any help would be appreciated. Thanks.

I suggest you make other arrangements. Maybe she can't or does not want to take you.