I was watching her mana the entire time and she did not have to drink once. After killing the second boss(End of time) the DPS probably saw that I was ahead of him on DPS and asked me to put my tanking gear on. At that point I asked the healer if she had had any difficulties healing me at any point and she said no, but she also asked me to put my tanking gear on. I told them I wasn't going to get my tanking gear from the bank because my bags were full and they kicked me.
Maybe she was afraid we'd wipe on the next boss or something, I don't know. Not everyone need to vote for the kick to go through, though. Only three votes are required in a 5man, two yes votes plus the vote from the player who started the votekick. I've seen plenty of kicks go through without my help.
They were all from the same guild, so I knew the healer wasn't going to side with me anyway. I just hoped they wouldn't go as far as kicking me. I probably sounded like a jerk when I refused to put my tanking gear on. I honestly don't remember. It was the first time I was kicked in a long time too, and I had done those dungeons as tank in DPS gear many times before.