Missed a meeting, she cut my hours! What should I do?

I am a waitress. I found out Wednesday that I had a 2:00 mandatory meeting at work on Saturday. I also found out Wednesday that my ex-husband and babysitter would not be available to watch our 1 year old daughter Saturday until my normal work time (10-6). I told 3 of the managers about my dilemma on Wednesday. I informed them that I would continue to look for a babysitter and let them know if I would be able to make it, or that I might have to bring my daughter to the meeting. I was told by other employees that the manager's daughter and other employees bring their children to meetings all the time, so I was not too concerned. On Saturday I still had not found a babysitter. It was snowing and hailing, and it is a thirty minute walk to my work (the bus takes an hour because it is two buses that are timed poorly). Two hours before the meeting I called the manager and told her about the situation. She yelled at me, saying that I had a week to prepare and that if I didn't show up she would write me up, and that if I brought my daughter to the meeting she would write me up. Since the consequence was the same either way, I chose not to risk my child's health taking her her out in freezing hail. It was, after all, the first hour of work that I had missed in the 3 1/2 months that I have worked there, and besides, the meeting are geared towards the silly children that work there that have to be told to wash their hands before touching the lemons and to check back on their tables and provide good customer service. I'm a grownup, and understand that my tips depend on me having common sense.

When I got to work last night, I found out that she had taken two scheduled work days away from me and berated me in the meeting in front of all of my coworkers for the second meeting in a row. She thinks that I am a bad server because I occassionally get complaints- from people who are trying to get free food. However, my tips consistently average 20%, which I believe says alot about my customer service skills.

I believe that I am treated differently than the people who are friends with her on facebook, and there were other people who took their kids to the meeting that did not get written up or lose hours. They were also not publicly berated.

I don't want to quit my job- I want to find a way to relate with her without being friends with her on facebook because I am looking for a more professional career eventually and I believe that would harm my reputation and chances. It is very unprofessional. I can't afford this drama, and truly believe that I'm a little too old for it. What should I do?